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Myoclonus: Introduction

Myoclonus: Contraction of a single muscle or muscle groups. See detailed information below for a list of 149 causes of Myoclonus, Symptom Checker, including diseases and drug side effect causes.

» Review Causes of Myoclonus: Causes | Symptom Checker »

Causes of Myoclonus:

The following medical conditions are some of the possible causes of Myoclonus. There are likely to be other possible causes, so ask your doctor about your symptoms.

» Review Causes of Myoclonus: Causes | Symptom Checker »

Home Diagnostic Testing and Myoclonus

Home medical tests possibly related to Myoclonus:

Causes of Types of Myoclonus:

Review causes of types of Myoclonus in more specific categories:

Myoclonus: Symptom Checker

Listed below are some combinations of symptoms associated with Myoclonus, as listed in our database. Visit the Symptom Checker, to add and remove symptoms and research your condition.

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Myoclonus Treatments

Some of the possible treatments listed in sources for treatment of Myoclonus may include:

Review further information on Myoclonus Treatments.

Drug interactions causing Myoclonus:

When combined, certain drugs, medications, substances or toxins may react causing Myoclonus as a symptom. Always advise your doctor of any medications or treatments you are using, including prescription, over-the-counter, supplements, herbal or alternative treatments.

Myoclonus: Comorbid Symptoms

Some of the comorbid or associated medical symptoms for Myoclonus may include these symptoms:

Causes of General Symptom Types

Research the causes of these more general types of symptom:

Causes of Similar Symptoms to Myoclonus

Research the causes of these symptoms that are similar to, or related to, the symptom Myoclonus:

Myoclonus: Deaths

Read more about causes and Myoclonus deaths.

Misdiagnosis and Myoclonus

Epilepsy misdiagnosed as schizophrenia: The book "Preventing Misdiagnosis of Women" reports on a case of a woman diagnosed with schizophrenia, but later diagnosed with a form of epilepsy called "temporal lobe epilepsy". more »

RLS sleep disorder causing night-time leg sensations often misdiagnosed: A common but relatively unknown sleep-related disorder called Restless Leg Syndrome (RLS) is often misdiagnosed. The more »

Vitamin B12 deficiency under-diagnosed: The condition of Vitamin B12 deficiency is a possible misdiagnosis of various conditions, such as multiple sclerosis (see symptoms of multiple sclerosis). See symptoms of Vitamin B12 deficiency or misdiagnosis more »

Myoclonus: Research Related Doctors & Specialists

Other ways to find a doctor, or use doctor, physician and specialist online research services:

Myoclonus: Undiagnosed Conditions

Conditions that are commonly undiagnosed in related areas may include:

Causes of Myoclonus listed in Disease Database:

Other medical conditions listed in the Disease Database as possible causes of Myoclonus as a symptom include:

Article Excerpts about Myoclonus

Myoclonus is a term that refers to brief, involuntary twitching of a muscle or a group of muscles. It describes a symptom and, generally, is not a diagnosis of a disease. (Source: excerpt from NINDS Myoclonus Information Page: NINDS)

Myoclonus describes a symptom and generally is not a diagnosis of a disease. It refers to sudden, involuntary jerking of a muscle or group of muscles. Myoclonic twitches or jerks usually are caused by sudden muscle contractions, called positive myoclonus, or by muscle relaxation, called negative myoclonus. Myoclonic jerks may occur alone or in sequence, in a pattern or without pattern. They may occur infrequently or many times each minute. Myoclonus sometimes occurs in response to an external event or when a person attempts to make a movement. The twitching cannot be controlled by the person experiencing it. (Source: excerpt from Myoclonus Fact Sheet: NINDS)

Myoclonus is a term that refers to brief, involuntary twitching of a muscle or a group of ... (Source: excerpt from NINDS Myoclonus Information Page: NINDS)

Myoclonus describes a symptom and generally is not a diagnosis of a disease. It... (Source: excerpt from Myoclonus Fact Sheet: NINDS)

Definitions of Myoclonus:

Involuntary shock-like contractions, irregular in rhythm and amplitude, followed by relaxation, of a muscle or a group of muscles. This condition may be a feature of some CENTRAL NERVOUS SYSTEMS DISEASES (e.g., EPILEPSY, MYOCLONIC). Nocturnal myoclonus may represent a normal physiologic event or occur as the principal feature of the NOCTURNAL MYOCLONUS SYNDROME. (From Adams et al., Principles of Neurology, 6th ed, pp102-3).
- (Source - Diseases Database)

A clonic spasm of a muscle or muscle group
- (Source - WordNet 2.1)

Shock-like contraction of a portion of a muscle, an entire muscle, or a group of muscles; may be part of a disease process or a normal physiological response.
- (Source - CRISP)

Myoclonus is listed as a "rare disease" by the Office of Rare Diseases (ORD) of the National Institutes of Health (NIH). This means that Myoclonus, or a subtype of Myoclonus, affects less than 200,000 people in the US population.
- (Source - National Institute of Health)

Detailed list of causes of Myoclonus

The list below shows some of the causes of Myoclonus mentioned in various sources:

How Common are these Causes of Myoclonus?

This information refers to the general prevalence and incidence of these diseases, not to how likely they are to be the actual cause of Myoclonus. Of the 149 causes of Myoclonus that we have listed, we have the following prevalence/incidence information:

  • 1 causes are "very common" diseases
  • 4 causes are "common" diseases
  • 2 causes are "uncommon" diseases
  • 5 causes are "rare" diseases
  • 4 causes are "very rare" diseases
  • 138 causes have no prevalence information.

Conditions listing medical symptoms: Myoclonus:

The following list of conditions have 'Myoclonus' or similar listed as a symptom in our database. This computer-generated list may be inaccurate or incomplete. Always seek prompt professional medical advice about the cause of any symptom.

Select from the following alphabetical view of conditions which include a symptom of Myoclonus or choose View All.

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Conditions listing medical complications: Myoclonus:

The following list of medical conditions have Myoclonus or similar listed as a medical complication in our database. The distinction between a symptom and complication is not always clear, and conditions mentioning this symptom as a complication may also be relevant. This computer-generated list may be inaccurate or incomplete. Always seek prompt professional medical advice about the cause of any symptom.


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Causes of Myoclonus Based on Risk Factors

This information shows analysis of the list of causes of Myoclonus based on whether certain risk factors apply to the patient:

  • Travel - has the patient travelled recently?
  • Diabetes - history of diabetes or family history of diabetes?

    Classifications of Myoclonus:

    Medical Conditions associated with Myoclonus:

    Spasms (2183 causes), Movement symptoms (6001 causes), Muscle symptoms (7251 causes), Musculoskeletal symptoms (6264 causes), Nerve symptoms (9132 causes), Neurological symptoms (9575 causes), Reflex symptoms (469 causes), Brain symptoms (2787 causes), Head symptoms (10192 causes), Autonomic nerve symptoms (345 causes), Tendon symptoms (412 causes)

    Symptoms related to Myoclonus:

    Alzheimer's disease (2 causes), Creutzfeldt-Jakob disease, Encephalitis (137 causes), Encephalopathy (185 causes), Epilepsy (132 causes), Drug withdrawal, Poisoning, Meningitis (160 causes), Reye's syndrome (10 causes), Viral encephalitis, Delirium tremens (2 causes)

    Medical articles on signs and symptoms:

    Doctor-patient articles related to symptoms and diagnosis:

    These general medical articles may be of interest:

    Related medical articles from our Disease Center for Myoclonus:

    More Ways To Research Medical Signs and Symptoms:


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