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Jerking muscle movements, also known as myoclonus, are brief, sudden muscle contractions that can occur in one muscle or a group of muscles. These movements are involuntary and can range from mild to severe. Myoclonus can occur on its own or as a symptom of another condition, such as epilepsy, autoimmune diseases, or blood and body chemistry imbalances. It can also be triggered by external stimuli such as noise, movement, or light. While myoclonus can sometimes be harmless, it is important to consult a healthcare provider if you notice new or frequent muscle jerks to rule out any underlying neurological or medical conditions.
| Characteristics | Values |
|---|---|
| Name of Condition | Myoclonus |
| Description | Brief, sudden, involuntary muscle movement (like a twitch, jerk, or spasm) |
| Causes | Unknown, but may be caused by an imbalance of neurotransmitters or triggered by a person's movement or surroundings |
| Risk Factors | Family history, kidney or liver disease, thyroid issues, electrolyte imbalance, dehydration, muscle fatigue, high-intensity exercise, etc. |
| Diagnosis | Electromyography (EMG), Electroencephalography (EEG), MRI or CT scan, blood or urine tests |
| Treatment | Muscle relaxants, stretching, massage |
| Severity | Mild to severe |
| Frequency | Rare to frequent |
| Affected Muscles | Single muscle or group of muscles |
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What You'll Learn
- Myoclonus is a brief, sudden muscle movement (like a twitch or spasm)
- Sleep myoclonus, or hypnic jerks, are sudden sharp muscle movements that happen as you fall asleep or wake up
- Opsoclonus myoclonus (OMS) is a rare disorder that affects the eyes and muscles
- Reticular reflex myoclonus starts in the brainstem and usually affects the whole body
- Muscle spasms (muscle cramps) are painful contractions and tightening of your muscles
Myoclonus is a brief, sudden muscle movement (like a twitch or spasm)
Myoclonus is a brief, involuntary, sudden muscle movement that resembles a twitch or spasm. It is caused by the incorrect activation of muscles and usually lasts a fraction of a second. Myoclonus can affect a single muscle or a group of them, including muscles in the hands, feet, shoulders, hips, back, or face. While myoclonus can occur in healthy individuals at some point in their lives, it can also be a symptom of various medical conditions, ranging from benign to severe.
There are several types of myoclonus, including positive and negative myoclonus. Positive myoclonus occurs when muscles contract or flex suddenly, while negative myoclonus, also known as asterixis, involves the sudden relaxation of muscles, sometimes described as a "hand-flapping tremor." Sleep myoclonus, or hypnic jerks, are sudden sharp muscle movements that occur during the transition between sleep and wakefulness. They can be associated with sleep disorders such as restless leg syndrome. Startle reflexes are another form of myoclonus, characterised by jump-like movements in response to surprises or scares.
Myoclonus can also be associated with seizures, particularly in conditions like epilepsy. Lennox-Gastaut Syndrome involves multiple seizure types and cognitive impairment. Progressive myoclonus epilepsy (PME) is a rare group of disorders characterised by myoclonic seizures and other neurological symptoms, which can be fatal. Benign neonatal sleep myoclonus (BNSM) is a harmless condition affecting newborns, causing sudden jerky movements during sleep, which typically resolves by six months of age.
Myoclonus can be categorised based on its origin in the nervous system. For instance, cortical myoclonus originates in the cerebral cortex, the outer layer of the brain. Reticular reflex myoclonus starts in the brainstem, often affecting the entire body and mimicking startle reflexes. Spinal myoclonus originates in the spinal cord and can involve muscle groups controlled by connected parts of the spinal cord. Peripheral myoclonus refers to myoclonic jerks originating from peripheral nerves outside the brain and spinal cord, such as hemifacial spasms.
While myoclonus is typically diagnosed through a physical examination, doctors may also employ additional tests such as electroencephalography (EEG) to record brain electrical activity, electromyography (EMG) to measure muscle electrical activity, and evoked potential studies to assess brain, brainstem, and spinal cord responses to specific stimuli. Treatment options are available, and early diagnosis can help minimise the impact of myoclonus on an individual's life.
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Sleep myoclonus, or hypnic jerks, are sudden sharp muscle movements that happen as you fall asleep or wake up
Muscle jerks are brief, sudden muscle movements that occur involuntarily and are beyond a person's control. This condition is called myoclonus, and it can manifest as a twitch, jerk, or spasm. Myoclonus can affect a single muscle or a group of muscles and usually lasts for a fraction of a second. While myoclonus can occur in healthy individuals at some point in their lives, it can also be a symptom of various medical conditions, ranging from mild to severe.
One particular type of myoclonus is sleep myoclonus, also known as hypnic jerks. These are sudden, sharp muscle movements that occur as a person falls asleep or wakes up. Sleep myoclonus can be startling, resembling a jump-like movement when surprised or scared. While it may not require treatment, it could indicate a more significant sleep disorder such as restless leg syndrome.
Benign neonatal sleep myoclonus (BNSM) is a specific form of sleep myoclonus that affects newborn babies. Newborns with BNSM exhibit sudden, jerky movements of their limbs or bodies during sleep. This condition is typically harmless and resolves in about 95% of cases by the time the baby reaches six months of age. Diagnosis of BNSM involves performing an electroencephalogram (EEG) to differentiate it from seizure activity.
Myoclonus can also be classified based on its origin in the nervous system. For instance, cortical myoclonus originates in the cerebral cortex, the outer layer of the brain. Reticular reflex myoclonus starts in the brainstem, which controls vital functions such as breathing, and can lead to whole-body spasms. Spinal myoclonus, on the other hand, originates in the spinal cord and can involve muscle groups controlled by connected parts of the spinal cord.
In summary, sleep myoclonus, or hypnic jerks, are sudden, sharp muscle movements occurring during the transition between sleep and wakefulness. While these jerks may be startling, they are often benign and may not require medical intervention. However, persistent or frequent muscle jerks could warrant consultation with a healthcare provider to rule out any underlying medical conditions and ensure peace of mind.
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Opsoclonus myoclonus (OMS) is a rare disorder that affects the eyes and muscles
Jerking muscle movements are known as myoclonus, which is a brief, sudden muscle movement (like a twitch, jerk, or spasm). Opsoclonus myoclonus (OMS), also known as Dancing Eyes-Dancing Feet Syndrome or Kinsbourne syndrome, is a rare disorder that affects the eyes and muscles and causes other problems.
In young children, OMS is often caused by a tumour called neuroblastoma, which triggers the immune system to attack the nervous system. In adults, OMS is most commonly related to lung or breast cancers. OMS can also occur independently or following a bacterial or viral infection. OMS is generally not a fatal disorder, and some people recover fully, while others continue to experience symptoms or suffer relapses.
People with OMS may experience irregular, rapid eye movements, jerking muscles in the arms or legs, poor coordination, hand tremors, difficulty speaking, eating, walking, or sleeping, behavioural changes, and decreased muscle tone. OMS can be treated with corticosteroids, intravenous immunoglobulin therapy, or other medications to treat specific symptoms.
Myoclonus can also be categorized based on where the movement starts in the nervous system. Cortical myoclonus starts in the cerebral cortex (the outer layer of the brain), while reticular reflex myoclonus starts in the brainstem, which controls vital functions such as breathing. Spinal myoclonus begins in the spinal cord and can involve muscle groups controlled by connected parts of the spinal cord. Peripheral myoclonus refers to myoclonic jerks originating from peripheral nerves outside the brain and spinal cord.
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Reticular reflex myoclonus starts in the brainstem and usually affects the whole body
Myoclonus is a type of uncontrollable movement that includes sudden, brief involuntary twitching, jerking, or spasms of a single muscle or a group of muscles. It is not a disease but may be symptomatic of another neurological condition. Myoclonus can be categorised based on where the movement starts in the nervous system.
Reticular reflex myoclonus starts in the brainstem, which is the part of the brain that controls vital functions such as breathing. Myoclonic jerks usually affect the whole body, mimicking a startle reflex. It can also be triggered by a person's movement or surroundings.
Reticular reflex myoclonus can be treated with medication such as clonazepam, which has been shown to be effective. However, there is no specific treatment for negative myoclonus, which is when muscles relax suddenly (a hand-flapping tremor). Other medications that have been anecdotally useful include anticholinergic agents, baclofen, tetrabenazine, acetazolamide, opiates, and gamma-aminobutyric acid receptor agonists.
Myoclonus can also be caused by seizures, especially myoclonic seizures, and can be a symptom of epilepsy. It can also be caused by blood and body chemistry imbalances, such as kidney or liver disease, or conditions affecting the thyroid. In rare cases, it can be caused by Wilson's disease.
In newborns, myoclonus is known as benign neonatal sleep myoclonus (BNSM), and it causes sudden, jerky movements of their limbs or bodies in their sleep. This condition is harmless and usually goes away by 6 months of age.
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Muscle spasms (muscle cramps) are painful contractions and tightening of your muscles
Muscle spasms, also known as muscle cramps, are painful, involuntary, and unpredictable contractions and tightening of your muscles. They can affect anyone at any time, in one or multiple areas of the body. While muscle spasms are common and usually not serious, they can be uncomfortable and even debilitating in severe cases.
Muscle spasms occur when a muscle involuntarily and forcibly contracts uncontrollably and cannot relax. They can involve part or all of a single muscle or several muscles in a group. The affected muscle feels tense and tight compared to other relaxed muscles. The spasm may last only a few seconds or up to 15 minutes, and the pain is localized at the site of the muscle. If the spasm persists for several seconds, it moves from being a muscle spasm to a muscle cramp.
There are various factors that can contribute to muscle spasms. Dehydration is a common cause. Perspiration during physical exertion or exercise leads to dehydration and the loss of electrolytes such as sodium, potassium, and calcium, which can trigger muscle spasms. Certain medications, diseases, and electrolyte imbalances can also increase the likelihood of muscle spasms. Additionally, inadequate stretching and age are risk factors, with muscle spasms becoming more frequent as we grow older.
While there is no instant cure for muscle spasms, there are several ways to manage and prevent them. Stretching and massaging the affected area can provide relief. Applying heat or ice, drinking fluids with electrolytes, and taking a warm shower or bath can also help. Over-the-counter pain relievers like ibuprofen or acetaminophen can alleviate pain and soreness. In severe or frequent cases, a healthcare provider may prescribe muscle relaxers, although these can have side effects such as drowsiness, dizziness, and nausea.
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Frequently asked questions
Jerking muscle movements are called myoclonus.
Myoclonus is a brief, sudden involuntary muscle movement that resembles a twitch, jerk, or spasm. It can affect a single muscle or a group of muscles.
Myoclonus can occur on its own or as a symptom of another condition, which is called secondary myoclonus. It is believed to be caused by an imbalance of neurotransmitters, which are chemicals that control movement. Myoclonus can also be caused by various other factors, including autoimmune diseases, blood and body chemistry imbalances, cerebral storage diseases, and system degenerations.
Symptoms of myoclonus include jerks or spasms that can range from mild to severe and may occur rarely or frequently. It can affect one region of the body or all muscle groups. In some cases, myoclonus may be accompanied by other symptoms such as seizures, cognitive impairment, or difficulty with speaking, eating, walking, or sleeping.
Myoclonus is typically diagnosed through a physical examination, electroencephalography (EEG), MRI or CT scans, and electromyography (EMG). Treatment options may include muscle relaxants, stretching, and massage. Early diagnosis and treatment can help minimize the impact of myoclonus on an individual's life.
