Muscle twitches are fine movements of a small area of muscle. Show
Muscle twitching is caused by minor muscle contractions in the area, or uncontrollable twitching of a muscle group that is served by a single motor nerve fiber. Muscle twitches are minor and often go unnoticed. Some are common and normal. Others are signs of a nervous system disorder. Causes may include:
Nervous system conditions that can cause muscle twitching include:
Symptoms of a nervous system disorder include:
No treatment is needed for benign muscle twitching in most cases. In other cases, treating an underlying medical cause may improve symptoms. Contact your health care provider if you have long-term or persistent muscle twitches or if twitching occurs with weakness or loss of muscle. Your provider will take a medical history and perform a physical exam. Medical history questions may include:
Tests depend on the suspected cause, and may include:
Muscle fasciculation; Fasciculations of muscle Deluca GC, Griggs RC. Approach to the patient with neurologic disease. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 26th ed. Philadelphia, PA: Elsevier; 2020:chap 368. Hall JE, Hall ME. Contraction of skeletal muscle. In: Hall JE, Hall ME, eds. Guyton and Hall Textbook of Medical Physiology. 14th ed. Philadelphia, PA: Elsevier; 2021:chap 6. Weissenborn K, Lockwood AH. Toxic and metabolic encephalopathies. In: Jankovic J, Mazziotta JC, Pomeroy SL, Newman NJ, eds. Bradley and Daroff's Neurology in Clinical Practice. 8th ed. Philadelphia, PA: Elsevier; 2022:chap 84. Updated by: Joseph V. Campellone, MD, Department of Neurology, Cooper Medical School at Rowan University, Camden, NJ. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team. Experiencing a muscle twitch can be uncomfortable and irritating. But what causes a muscle twitch, and could it indicate an underlying health condition? A muscle twitch is an involuntary contraction of the fibers that make up a muscle. Nerves control muscle fibers. When something stimulates or damages a nerve, it causes the muscle fibers to contract, resulting in a twitch. A person can often see or feel these twitches below the skin. In this article, we explore the numerous causes of muscle twitches. Most of the reasons for them are harmless though some are more serious. We also discuss how to treat and prevent muscle twitches. Muscle twitching, also known as fasciculation, has many common causes. These include: OverexertionStrain or overuse of a muscle can cause twitches. When a person exercises vigorously or for a long period, they may experience muscle twitching. Research suggests this muscle twitching may happen after exercise for two reasons:
The arms and legs are common places to experience muscle twitching that overexertion causes. The most worked muscles are most likely to twitch, which can include the calf, thigh, or biceps, depending on the exercise. Not getting enough sleepBrain chemicals, or neurotransmitters, play a role in transmitting information from the brain to the nerves that control muscle contraction. Sleep deprivation may affect how neurotransmitter receptors work. This means excess neurotransmitters may build up in the brain. The impact that a lack of sleep has on neurotransmitters function may lead to muscle twitching. A common place to experience muscle twitching from tiredness is in the eyelid. CaffeineDrinking too much coffee, tea, or energy drinks that contain caffeine may cause muscle twitching. Caffeine is a stimulant. When a person has too much of it, caffeine can stimulate muscle twitching anywhere in the body. Calcium deficiencyThe body needs calcium to support proper muscle function. Having a calcium deficiency may cause muscle twitching. Calcium deficiency is known as hypocalcemia. People can get calcium from dairy products, soya beans, tofu, nuts, and leafy greens. Magnesium deficiencyMagnesium also plays a role in keeping the nerves and muscles healthy. Magnesium helps to transport calcium across cell membranes to support nerve and muscle function. Having a magnesium deficiency may cause muscle twitching anywhere in the body, including the face. Magnesium deficiency is known as hypomagnesemia. Causes of magnesium deficiency include:
If people do not address a magnesium deficiency, it may increase their risk of cardiovascular disease. Vitamin D deficiencyNerves need vitamin D to carry messages to and from the brain to the body’s muscles. Having a vitamin D deficiency may cause muscle weakness and twitching. Causes of vitamin D deficiency include lack of exposure to sunshine and poor diet. DehydrationMuscle mass is up to 75 percent water. Water also helps to carry nutrients and minerals to muscles to support their function. When a person does not drink enough water, they may develop dehydration. Having dehydration may cause muscle twitching. Stress and anxietyExperiencing psychological stress or high anxiety levels may prompt excess muscle tension. This complication can lead to muscles twitching. Muscle twitches caused by stress can occur anywhere in the body. Certain medicationsCertain medications can lead to involuntary muscle twitching. This reaction may be a side effect or due to interactions with other drugs. People can discuss side effects and drug interactions with the doctor when taking a new medication. Muscle twitching that is not explained by one of the common causes above may indicate an underlying health condition. Health conditions that can lead to muscle twitching include: Pinched spinal nerveA pinched spinal nerve, known as radiculopathy, may cause muscle twitching and spasms. Other symptoms include a tingling or numb feeling in the foot or leg. A herniated disk can cause a pinched nerve, often the result of trauma. When a disk in the spine is damaged, it may squeeze the root of the corresponding nerve. Amyotrophic lateral sclerosisALS is a rare neurological condition. Muscle twitching may be a sign of a degenerative neurological condition called amyotrophic lateral sclerosis (ALS). This is a rare condition. ALS causes a person’s nerve cell function to deteriorate gradually. Nerve cells, or neurons, control a person’s voluntary muscle function, which allows people to move. When a person’s neurons stop functioning, their muscles are not able to work properly. This causes:
Over time, a person with ALS may lose the ability to control their movements. This can make walking, talking, eating, and breathing difficult. Isaacs’ syndromeIsaacs’ syndrome is a neuromuscular condition that may cause muscle twitches. A person with Issacs’ syndrome has overactive peripheral nerve axons. This means that their nerves continuously trigger their muscle fibers. This causes muscle contractions even when someone is resting. Other symptoms of Isaacs’ syndrome include:
LupusMuscle twitching may be a sign of lupus, though this condition is not common. Lupus is a long-term autoimmune condition where a person’s body mistakenly attacks healthy tissue. Lupus may cause certain muscle groups to become inflamed. This inflammation is called myositis. Muscle twitching is a symptom of myositis. Multiple sclerosisRarely, muscle twitching may be a sign of multiple sclerosis (MS). MS is a degenerative condition that affects a person’s central nervous symptom. A common symptom of MS is spasticity. Spasticity is when muscles become stiff and contract involuntarily. Muscle twitching may be a sign of spasticity. Other symptoms of MS include:
A muscle twitch and a muscle spasm are both involuntary contractions of a muscle, although they are not quite the same. A muscle twitch is a short contraction that may happen repeatedly. It can cause discomfort but is not typically painful. A muscle spasm is a prolonged contraction that may cause pain. Muscle spasms are also known as muscle cramps. They often happen after exercise. The doctor may ask a person to discuss when their muscle twitching started, how often it happens, and how it feels. They may also ask about related symptoms. If the doctor thinks a person’s muscle twitching is due to an underlying condition, they will give the individual a series of tests. This may include electromyography to assess muscle and nerve function. A balanced and varied diet can provide essential vitamins and minerals for muscle health. The common causes of muscle twitching are easy to treat and prevent at home through lifestyle changes to keep the nerves and muscles healthy and functioning well. These lifestyle changes include:
If an underlying health condition is the reason for a person’s muscle twitches, the doctor will work with the individual on a treatment plan. If someone experiences muscle twitching that one of the common causes above cannot easily explain, they should speak to their doctor. It is also a good idea to speak to the doctor if muscle twitching occurs alongside other, new symptoms. Muscle twitching has many everyday causes that are not serious. People can easily treat these causes at home and prevent them through specific lifestyle changes. Some causes of muscle twitching are more serious, but these conditions are mostly rare. The health conditions that may cause muscle twitching are explored above. If a doctor diagnoses someone with a degenerative condition, such as MS or ALS, they will support them to manage their symptoms. While these conditions have no cure, the right treatment plan can ensure a person maintains a good quality of life. Read the article in Spanish. Is body twitching serious?A twitching muscle can be annoying, to be sure, but, fortunately, it's rarely serious. "Some people are just more prone to experiencing fasciculations," says Dr. Ondo. "If you've had them for many years and haven't noticed any other changes in your muscle, there's likely nothing to be concerned about."
When should I worry about muscle twitching?Muscle twitching typically isn't an emergency, but a serious medical condition may be causing it. Make an appointment with your doctor if your twitching becomes a chronic or persistent issue.
What are twitching signs of?Causes. Alcohol intake.. Bright light.. Caffeine excess.. Fatigue.. Irritation of the eye surface or inner eyelids.. Smoking.. Stress.. Wind or air pollution.. Why do parts of my skin twitch?Overview. Hemifacial spasm is a nervous system disorder in which the muscles on one side of your face twitch involuntarily. Hemifacial spasm is most often caused by a blood vessel touching or pulsating against a facial nerve. It may also be caused by a facial nerve injury or a tumor.
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