What causes Bell's Palsy? Bell’s palsy, also known as peripheral facial nerve palsy, can occur at any age, according to the Mayo Clinic. Additional projects seek to identify the mechanisms and consequences of neuroinflammation on peripheral nerve function. Bell's palsy can trigger an increased sensitivity to sound known as hyperacusis. [39] There is very tentative evidence for hyperbaric oxygen therapy in severe disease.[40]. An understanding of how to regenerate peripheral nerves may lead to ways to prevent nerve damage and injuries from occurring. 301-594-5983 Request for Information: Draft 2021-2026 NINDS Strategic Plan, Date last modified: Fri, 2020-10-02 13:08, High School, Undergraduate, & Post-Baccalaureate, Interagency Research Coordinating Committees, National Advisory Council (NANDSC) Meeting - May 2021, NINDS Contributions to Approved Therapies, NINDS Interpretation of the NIH GDS Policy, Administrative, Executive, and Scientific Careers, Get the latest funding, research, and public health information from NINDS, Get the latest research information from NIH, Get the latest public health information from HHS, Get the latest public health information from CDC, National Organization for Rare Disorders (NORD), Office of Global Health and Health Disparities. There has been limited discussion of any connection between Bell's Palsy and the vaccinations. Bell’s palsy is a unilateral paralysis of facial muscles. The number of new cases of Bell's palsy ranges from about one to four cases per 10,000 population per year. Information also is available from the following organizations: National Organization for Rare Disorders (NORD) Other therapies such as physical therapy, facial massage, or acupuncture may provide a potential small improvement in facial nerve function and pain. [12], Although the facial nerve innervates the stapedius muscle of the middle ear (through the tympanic branch), sound sensitivity, causing normal sounds to be perceived as very loud (hyperacusis), and dysacusis are possible but hardly ever clinically evident. It affects approximately 1 person in 65 during a lifetime. [email protected] Bethesda, MD 20824 [1] Symptoms can vary from mild to severe. If no specific cause can be identified, the condition can be diagnosed as Bell's palsy. [1] Males and females are affected equally. [26] In up to 10–15% of Lyme infections, facial palsy appears several weeks later, and may be the first sign of infection that is noticed, as the Lyme rash typically does not itch and is not painful. [1] Risk factors include diabetes, a recent upper respiratory tract infection, and pregnancy. For more information on neurological disorders or research programs funded by the National Institute of Neurological Disorders and Stroke, contact the Institute's Brain Resources and Information Network (BRAIN) at: BRAIN [9] Management during pregnancy is similar to management in the non-pregnant. What is Bell's Palsy? Typically symptoms come on over 48 hours. The major differences in this condition are the presence of small blisters, or vesicles, on the external ear and hearing disturbances, but these findings may occasionally be lacking (zoster sine herpete). Trying Alternative Treatments Practice biofeedback. [6], They are commonly prescribed due to a theoretical link between Bell's palsy and the herpes simplex and varicella zoster virus. [32] There is still the possibility that they might result in a benefit less than 7% as this has not been ruled out. A person attempting to show his teeth and raise his eyebrows with Bell's palsy on his right side. [37] A Cochrane review (updated in 2021), after reviewing applicable randomized and quasi-randomized controlled trials was unable to determine if early surgery is beneficial or harmful. [24][33], Physiotherapy can be beneficial to some individuals with Bell's palsy as it helps to maintain muscle tone of the affected facial muscles and stimulate the facial nerve. It is thought that as a result of inflammation of the facial nerve, pressure is produced on the nerve where it exits the skull within its bony canal (the stylomastoid foramen), blocking the transmission of neural signals or damaging the nerve. Get the latest funding, research, and public health information from NINDS 8600 Rockville Pike Danbury, CT 06810 [3] Early treatment (within 3 days after the onset) is necessary for benefit[29] with a 14% greater probability of recovery. Video: Bell's palsy Specialist Facial Therapy Facebook Live Recorded in March 2021 for Facial Palsy Awareness Week, Catriona Neville speaks extensively about the benefits of specialist facial therapy. [44] This is also called gustatolacrimal reflex or Bogorad's syndrome and involves the sufferer shedding tears while eating. Individuals may also have facial pain or abnormal sensation, altered taste, and intolerance to loud noise. [31] Another review found a benefit when combined with corticosteroids but stated the evidence was not very good to support this conclusion. Bell's palsy is temporary weakness or lack of movement affecting 1 side of the face. In general, decompression surgery for Bell's palsy—to relieve pressure on the nerve—is controversial. [1] It is named after Scottish surgeon Charles Bell (1774–1842), who first described the connection of the facial nerve to the condition. For individuals with new-onset Bell’s palsy, steroids are highly likely to be effective and can increase the probability of recovery of facial nerve function. In some research, the herpes simplex virus type 1 (HSV-1) has been identified in a majority of cases diagnosed as Bell's palsy through endoneurial fluid sampling. The facial nerve in the temporal bone channel. [1, 2, 3] Advertisement . Bell's palsy is characterized by drooping of the face. Bell’s palsy afflicts approximately 40,000 Americans each year. Unlike a stroke, the facial weakness develops gradually. Bell's palsy, also known as idiopathic facial palsy, is a form of temporary facial paralysis or weakness on one side of the face. Blood tests can sometimes help in diagnosing other concurrent problems such as diabetes and certain infections. [8] It most commonly occurs in people between ages 15 and 60. The patients who regain movement within the first two weeks nearly always remit entirely. For example, in one research project, scientists are studying two genes to identify the molecular mechanisms involved in the regeneration of nerve projections (axons) to their original targets. National Institutes of Health/DHHS Bell’s Palsy, or facial palsy, is a paralysis or severe weakness of the facial muscles on one side of the face. The NINDS conducts and supports an extensive research program of basic science to increase understanding of how the nervous system works and what causes the system to sometimes go wrong, leading to dysfunction. National Institute of Neurological Disorders and Stroke [2], The condition normally gets better by itself with most achieving normal or near-normal function. [1] Other symptoms include drooping of the eyelid, a change in taste, and pain around the ear. Part of this research program focuses on learning more about the circumstances that lead to nerve damage and the conditions that cause injuries and damage to nerves. [1], Bell's palsy is the most common cause of one-sided facial nerve paralysis (70%). Currently, there's no known cure for Bell palsy. Antiviral agents (in addition to steroids) might increase the probability of recovery of facial function, although their benefit has not been clearly established. [1] They may include muscle twitching, weakness, or total loss of the ability to move one, and in rare cases, both sides of the face. Bell's palsy is caused by damage to a single nerve, whereas a … [1] Bell's palsy can trigger an increased sensitivity to sound known as hyperacusis. [37], The efficacy of acupuncture remains unknown because the available studies are of low quality (poor primary study design or inadequate reporting practices). Knowledge gained from this research may help scientists find the definitive cause of Bell's palsy, leading to the discovery of new effective treatments for the disorder. Babies can be born with facial palsy. They may include muscle twitching, weakness, or total loss of the ability to move one, and in rare cases, both sides of the face. In these conditions, the neurologic findings are rarely restricted to the facial nerve. Most often these symptoms lead to significant facial distortion. [1] Diagnosis is based on a person's appearance and ruling out other possible causes. On rare occasions, cosmetic or reconstructive surgery may be needed to reduce deformities and correct some damage such as an eyelid that will not fully close or a crooked smile. In some mild cases where recovery is rapid, there is damage only to the myelin sheath (the fatty covering that acts as insulation of nerve fibers). Because the facial nerve has so many functions and is so complex, damage to the nerve or a disruption in its function can lead to many problems. Bell's palsy is a form of temporary facial paralysis resulting from damage or trauma to one of the facial nerves. Keeping the eye moist and protecting it from debris and injury, especially at night, is important. Fax: 203-798-2291, National Library of Medicine A range of annual incidence rates have been reported in the literature: 15,[18] 24,[46] and 25–53[14] (all rates per 100,000 population per year). Risk factors for Bell’s palsy include pregnancy, preeclampsia, obesity, hypertension, diabetes, and upper respiratory ailments. [29] A number of different techniques exist. There are two facial nerves, one for the right side of the face and one for the left. Patients will usually find that one-half of their face droops as the muscles are no longer supporting it. And unlike Bell's palsy, a stroke will usually let patients control the upper part of their faces. Reactivation of existing herpes zoster infection leading to facial paralysis in a Bell's palsy type pattern is known as Ramsay Hunt syndrome type 2. Adverse effects include hearing loss which occurs in 3–15% of people. The nerve becomes inflamed and swollen and stops functioning properly. How is it treated? It is the most common cause of facial droop, which is a term that indicates the look of a patient's face that is slack on one side from loss of muscle tone. [1] Often signs of improvement begin within 14 days, with complete recovery within six months. One study found that 45% of patients are not referred to a specialist, which suggests that Bell's palsy is considered by physicians to be a straightforward diagnosis that is easy to manage. For instance, regrowth of nerves controlling muscles attached to the eye may sidetrack and also regrow connections reaching the muscles of the mouth. The cause of Bell's palsy is unknown. Get the latest public health information from CDC. Bell’s palsy can cause drooping or weakness on one side of your face. WebMD explains the signs and symptoms of this condition. This nerve damage mechanism is different from the above-mentioned—that edema, swelling and compression of the nerve in the narrow bone canal is responsible for nerve damage. Several other conditions can also cause facial paralysis, for example, brain tumor, stroke, myasthenia gravis, and Lyme disease. Bell's palsy, also known as idiopathic facial palsy, is a form of temporary facial paralysis or weakness on one side of the face. By definition, no specific cause can be determined. Bell’s palsy occurs when the nerve that controls the facial weakness or paralysis. Other symptoms include drooping of the eyelid, a change in taste, and pain around the ear. [22] Other research, however, identified, out of a total of 176 cases diagnosed as Bell's palsy, HSV-1 in 31 cases (18%) and herpes zoster in 45 cases (26%).[16]. Diagnostic imaging using magnetic resonance imaging (MRI) or a computed tomography (CT) scan can rule out other structural causes of pressure on the facial nerve (such as an artery compressing the nerve) and also check the other nerves. To the average person, the signs of Bell's palsy look a lot like a stroke's symptoms, but they are vastly different. [2][45] Bell's palsy affects about 40,000 people in the United States every year. This is a process of learning to train your mind … [1][5], Some viruses are thought to establish a persistent (or latent) infection without symptoms, e.g., the varicella zoster virus[15] and the Epstein–Barr virus, both of the herpes family. Major possible complications of the condition are chronic loss of taste (ageusia), chronic facial spasm, facial pain and corneal infections. Bell’s palsy causes temporary paralysis, or palsy, of facial muscles. [9] In those who are unable to close their eyes, eye protective measures are required. Gustatorial sweating can also occur. None of … [10][11], The facial nerve controls a number of functions, such as blinking and closing the eyes, smiling, frowning, lacrimation, salivation, flaring nostrils and raising eyebrows. Bell’s palsy is a condition that causes a temporary weakness or paralysis of the muscles in the face. But recovery usually begins 2 weeks to 6 months from the start of the symptoms. [14], Other conditions that can cause similar symptoms include herpes zoster, Lyme disease, sarcoidosis, stroke, and brain tumors. Typically symptoms come on over 48 hours. The prognosis of this condition is generally very good. Three common forms are cerebral palsy, Bell’s palsy, and brachial palsy. How is it diagnosed? Symptoms can vary from mild to severe. [14], The cause of Bell's palsy is unknown. When remission does not occur until the third week or later, a significantly greater part of the patients develop sequelae. Where can I get more information? It affects men and women equally and can occur at any age, but it is less common before age 15 or after age 60. It is associated with other conditions such as diabetes. It was discovered by Scottish neurologist and anatomist Sir Charles Bell and refers to facial … [5], Corticosteroids such as prednisone improve recovery at 6 months and are thus recommended. Cornelis Stalpart van der Wiel (1620–1702) in 1683 gave an account of Bell's palsy and credited the Persian physician Ibn Sina (980–1037) for describing this condition before him. The NINDS is a component of the National Institutes of Health (NIH), the leading supporter of biomedical research in the world. After a follow-up of at least one year or until restoration, complete recovery had occurred in more than two-thirds (71%) of all patients. Bethesda, MD 20892. Note how the forehead is not spared. A test called electromyography (EMG, which uses very thin wire electrodes that are inserted into a muscle to assess changes in electrical activity that occur during movement and when the muscle is at rest) can confirm the presence of nerve damage and determine the severity and the extent of nerve involvement. Analgesics such as aspirin, acetaminophen, or ibuprofen may relieve pain. Symptoms of Bell's palsy usually begin suddenly and reach their peak within 48 hours. 888-346-3656. This report indicated 795 reports related to blood clotting disorders with 400 attributed to Pfizer, 337 to Moderna and 56 to Johnson & Johnson between Dec. 14, … In this way, movement of one also affects the other. Bell's palsy refers to a condition in which the muscles of the face become paralyzed. Patients with facial palsy for which an underlying cause can be found are not considered to have Bell's palsy per se. Reactivation of an existing (dormant) viral infection has been suggested as a cause of acute Bell's palsy. [1] Other conditions that can cause facial weakness include brain tumor, stroke, Ramsay Hunt syndrome type 2, myasthenia gravis, and Lyme disease. Received my 2nd Moderna vaccination on 2-25-2021. Facial palsy is typified by inability to move the muscles of facial expression. [17], Familial inheritance has been found in 4–14% of cases. Prepared by: [9], Once the facial paralysis sets in, many people may mistake it as a symptom of a stroke; however, there are a few subtle differences. Bell's palsy is the result of a malfunction of the facial nerve (cranial nerve VII), which controls the muscles of the face. A notable person with Bell's palsy is former Prime Minister of Canada Jean Chrétien. P.O. Tel: 203-744-0100; Voice Mail: 800-999-NORD (6673) Get the latest research information from NIH | Español Possible causes of facial paralysis include tumor, meningitis, stroke, diabetes mellitus, head trauma and inflammatory diseases of the cranial nerves (sarcoidosis, brucellosis, etc.). It occurs when a condition, such as a viral infection, causes inflammation and swelling of the seventh cranial nerve (the nerve that controls facial muscles). [12][13], Although defined as a mononeuritis (involving only one nerve), people diagnosed with Bell's palsy may have "myriad neurological symptoms" including "facial tingling, moderate or severe headache/neck pain, memory problems, balance problems, ipsilateral limb paresthesias, ipsilateral limb weakness, and a sense of clumsiness" that are "unexplained by facial nerve dysfunction". Each has several branches. Other symptoms may include drooping of the mouth, drooling, inability to close eye (causing dryness of the eye), and excessive tearing in one eye. [4], The cause of Bell's palsy is unknown. [1] Surgery is generally not recommended. It is the most common cause of facial paralysis. Although the exact cause, symptoms, and treatments vary from one condition to the next, all forms are characterized by a loss of motor function. What research is being done? [34] It is important that muscle re-education exercises and soft tissue techniques be implemented prior to recovery in order to help prevent permanent contractures of the paralyzed facial muscles. As the facial nerve swells and becomes inflamed in reaction to the infection, it causes pressure within the Fallopian canal (a bony canal through which the nerve travels to the side of the face), leading to the restriction of blood and oxygen to the nerve cells. [1] Many believe that this is due to a viral infection that results in swelling. Majority of the people with Bell’s palsy recover completely with treatment. [45] The rate increases with age. You might think it’s a stroke, but it’s not. [27][28] The likelihood that the facial palsy is caused by Lyme disease should be estimated, based on recent history of outdoor activities in likely tick habitats during warmer months, recent history of rash or symptoms such as headache and fever, and whether the palsy affects both sides of the face (much more common in Lyme than in Bell's palsy). Most people with Bell's palsy start to regain normal facial function within 3 weeks—even those who do not receive treatment. Two cases were idiopathic and the third was due to a tumour of the parotid gland. Bell's palsy can interrupt the eyelid's natural blinking ability, leaving the eye exposed to irritation and drying. What is the prognosis? The facial nerve also carries nerve impulses to the tear glands, the saliva glands, and the muscles of a small bone in the middle of the ear. But in rare cases, it doesn't disappear. Some individuals with co-existing conditions may not respond well to or be able to take steroid drugs. Another important factor in treatment is eye protection. James Douglas (1675–1742) and Nicolaus Anton Friedreich (1761–1836) also described it. Recovery was judged moderate in 12% and poor in only 4% of patients. In some cases, residual muscle weakness lasts longer or may be permanent. Bell’s palsy affects about 40,000 people in the United States every year. The paralysis is of the infranuclear/lower motor neuron type. 55 Kenosia Avenue There is no specific laboratory test to confirm diagnosis of the disorder. Exactly what causes this damage, however, is unknown. Another complication can occur in case of incomplete or erroneous regeneration of the damaged facial nerve. The extent of recovery and the time required for complete recovery from Bell’s palsy depends on the extent of nerve damage. [1], Bell's palsy is characterized by a one-sided facial droop that comes on within 72 hours. Bell’s palsy is an idiopathic condition meaning that the cause is often unknown. The facial nerve also transmits taste sensations from the tongue. Anaphylaxis, Bell’s Palsy, Guillain-Barré Syndrome, and miscarriages are some of the most prominent events. Some individuals may be left with mild residual facial weakness or show moderate to severe deficits. [35] There is no high quality evidence to support the role of electrical stimulation for Bell's palsy. [29] Smile surgery or smile reconstruction is a surgical procedure that may restore the smile for people with facial nerve paralysis. It results from dysfunction of cranial nerve VII (facial nerve) which directs the muscles on one side of the face, including those that control eye blinking and closing and facial expressions such as smiling. [2][7] It occurs in 1 to 4 per 10,000 people per year. All NINDS-prepared information is in the public domain and may be freely copied. Impaired immunity from stress, sleep deprivation, physical trauma, minor illness or autoimmune syndromes are suggested as the most likely triggers. It can affect anyone of any gender and age, but its incidence seems to be highest in those in the 15- to 45-year-old age group. [23][24], In areas where Lyme disease is common, it accounts for about 25% of cases of facial palsy. Bell’s palsy is a facial paralysis resulting from the damage or trauma of the 7th cranial nerve or the facial nerve. For example, when the person closes the eye, the corner of the mouth lifts involuntarily. [16] This new activation could be triggered by trauma, environmental factors, and metabolic or emotional disorders. [43] A third study found a better prognosis for young patients, aged below 10 years old, while the patients over 61 years old presented a worse prognosis.[17]. [19], In December 2020, the U.S. FDA recommended that recipients of the Pfizer and Moderna COVID-19 vaccines should be monitored for symptoms of Bell's palsy after several cases were reported among clinical trial participants, though the data was not sufficient to determine whether a causality link exists.[20]. This is thought to be due to faulty regeneration of the facial nerve, a branch of which controls the lacrimal and salivary glands. The Persian physician Muhammad ibn Zakariya al-Razi (865–925) detailed the first known description of peripheral and central facial palsy.[47][48]. This page was last edited on 16 March 2021, at 18:11. Most people get better within 9 months. On April 16th out of the complete blue waking up with one side of face completely numb. It happens when the facial nerve that connects the brain and facial muscles sustain damage. [30], When Bell's palsy affects the blink reflex and stops the eye from closing completely, frequent use of tear-like eye drops or eye ointments is recommended during the day and protecting the eyes with patches or taping them shut is recommended for sleep and rest periods. [21] In a few cases, bilateral facial palsy has been associated with acute HIV infection. If that likelihood is more than negligible, a serological test for Lyme disease should be performed, and if it exceeds 10%, empiric therapy with antibiotics should be initiated, without corticosteroids, and reevaluated upon completion of laboratory tests for Lyme disease. What are the symptoms? Bell's palsy is a type of facial paralysis that results in a temporary inability to control the facial muscles on the affected side of the face. The mission of the National Institute of Neurological Disorders and Stroke (NINDS) is to seek fundamental knowledge about the brain and nervous system and to use the knowledge to reduce the burden of neurological disease. Bell's palsy is the most common form of facial paralysis which causes a weakness of the muscles in the face. National Institutes of Health [2] About 1.5% of people are affected at some point in their lives. Bell's palsy is a type of facial paralysis that results in a temporary inability to control the facial muscles on the affected side of the face. A person with a stroke will usually have some wrinkling of their forehead. Generally, Bell's palsy affects only one side of the face; however, in rare cases, it can affect both sides. [9] In rare cases (<1%), it can occur on both sides resulting in total facial paralysis. [18] There may also be an association with migraines. The pain areas are in the ears. Bell's palsy is not a reportable disease, and there are no established registries for people with this diagnosis, which complicates precise estimation. [34] To reduce pain, heat can be applied to the affected side of the face. [36], Surgery may be able to improve outcomes in facial nerve palsy that has not recovered. (There are 12 pairs of cranial nerves, identified by Roman numerals.) [1] Corticosteroids have been found to improve outcomes, while antiviral medications may be of a small additional benefit. Bell’s palsy is a condition that causes these muscles to do just that. [1] A few may not recover completely or have a recurrence of symptoms. Sir Charles Bell, for whom the condition is named, presented three cases at the Royal Society of London in 1829. Bell’s palsy can develop equally in both males and females; however, they seem to occur more in people with diabetes, cough, cold, and flu. A stroke will usually cause a few additional symptoms, such as numbness or weakness in the arms and legs. Facial paralysis resulting from dysfunction in the cranial nerve VII (facial nerve), randomized and quasi-randomized controlled trials, "Corticosteroids for Bell's palsy (idiopathic facial paralysis)", "Antiviral treatment for Bell's palsy (idiopathic facial paralysis)", "Bilateral facial paralysis: case presentation and discussion of differential diagnosis", "Annualized incidence and spectrum of illness from an outbreak investigation of Bell's palsy", Facial Nerve Problems and Bell's Palsy Information on MedicineNet.com, "FDA staff recommends watching for Bell's palsy in Moderna and Pfizer vaccine recipients", MedlinePlus Medical Encyclopedia: Facial nerve palsy due to birth trauma, 10.7326/0003-4819-124-1_Part_1-199601010-00005, S.C. TV Reporter Loses Her Smile after a Bell's Palsy Attack, "Diagnosis and management of Lyme disease", "Evidence-based guideline update: steroids and antivirals for Bell palsy: report of the Guideline Development Subcommittee of the American Academy of Neurology", "Surgical interventions for the early management of Bell's palsy", "Bell Palsy: Updated Guideline for Treatment", "Peripheral facial palsy: etiology, diagnosis and treatment", "The history of facial palsy and spasm: Hippocrates to Razi", Hereditary neuropathy with liability to pressure palsy, Chronic inflammatory demyelinating polyneuropathy, https://en.wikipedia.org/w/index.php?title=Bell%27s_palsy&oldid=1012498723, Short description is different from Wikidata, Wikipedia medicine articles ready to translate, Creative Commons Attribution-ShareAlike License. Physical trauma, minor illness or autoimmune syndromes are suggested as the muscles on one side of 7th! Its exact cause is unknown palsy caused by Lyme disease. [ 24 in. 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