Overview
Rare myoclonus is an uncommon movement disorder characterized by sudden, brief, involuntary muscle jerks or twitches. Myoclonus itself refers to quick, shock-like movements that a person cannot control. In rare forms of myoclonus, these jerks may occur in unusual patterns, affect uncommon body regions, or arise from causes that are not frequently seen. The muscle jerks can happen when a person is at rest, during movement, or in response to a stimulus such as a sudden noise or touch. Myoclonus can affect one muscle, a group of muscles, or multiple areas of the body. It may interfere with walking, eating, speaking, or performing fine tasks with the hands. The severity varies widely — some people experience only mild, occasional twitches, while others have frequent and disabling jerks that significantly impact daily life. The treatment landscape for rare myoclonus focuses mainly on managing symptoms, since the underlying cause may be difficult to identify or may not have a specific cure. Medications such as clonazepam, valproic acid, and levetiracetam are commonly used to reduce the frequency and severity of the jerks. In some cases, treating an underlying condition (such as a metabolic disorder or infection) can improve or resolve the myoclonus. Research is ongoing to better understand the many rare causes of myoclonus and to develop more targeted therapies.
Key symptoms:
Sudden, brief involuntary muscle jerksTwitching of arms, legs, or the whole bodyJerks triggered by noise, light, or touchDifficulty with coordination and balanceTrouble walking or maintaining postureDifficulty with fine hand movements like writingSpeech difficulties due to facial or throat muscle jerksJerks that worsen with stress or fatigueMuscle stiffness or tensionSleep disruption due to nighttime jerksDifficulty eating or swallowing in severe cases
Variable
Can be inherited in different ways depending on the underlying gene
Variable
Can begin at different ages, from infancy through adulthood
FDA & Trial Timeline
1 eventNational Human Genome Research Institute (NHGRI) — NA
Data sourced from FDA regulatory filings and ClinicalTrials.gov. Updated periodically.
Treatments
No FDA-approved treatments are currently listed for Rare myoclonus.
1 clinical trialare actively recruiting — trials can provide access to cutting-edge therapies.
View clinical trials →Rare Disease Specialist
Treatment Centers
8 centersNational Institutes of Health Clinical Center
📍 Bethesda, Maryland
👤 Payal P Khincha, M.D.
👤 Christopher Grunseich, M.D.
Stanford Medicine Rare Disease Center ↗
Stanford Medicine
📍 Stanford, CA
🏥 NORDMayo Clinic Center for Individualized Medicine ↗
Mayo Clinic
📍 Rochester, MN
👤 Mayo Clinic Center for Individualized Medicine
🔬 UDNUCLA UDN Clinical Site ↗
UCLA Health
📍 Los Angeles, CA
🔬 UDNBaylor College of Medicine UDN Clinical Site ↗
Baylor College of Medicine
📍 Houston, TX
🔬 UDNHarvard/MGH UDN Clinical Site ↗
Massachusetts General Hospital
📍 Boston, MA
🔬 UDNNIH Clinical Center Undiagnosed Diseases Program ↗
National Institutes of Health
📍 Bethesda, MD
🏥 NORDBaylor College of Medicine Rare Disease Center ↗
Baylor College of Medicine
📍 Houston, TX
Travel Grants
No travel grants are currently matched to Rare myoclonus.
Community
No community posts yet. Be the first to share your experience with Rare myoclonus.
Start the conversation →Latest news about Rare myoclonus
Disease timeline:
New trial: Natural History of Glycosphingolipid Storage Disorders and Glycoprotein Disorders
Phase NA trial recruiting.
Caregiver Resources
NORD Caregiver Resources
Support, advocacy, and financial assistance for caregivers of rare disease patients.
Mental Health Support
Rare disease caregiving can be isolating. Connect with counseling and peer support.
Family & Caregiver Grants
Financial assistance programs specifically for caregivers of rare disease patients.
Social Security Disability
Learn how rare disease patients may qualify for SSDI/SSI benefits.
Questions for your doctor
Bring these to your next appointment
- Q1.What type of myoclonus do I have, and what is the likely underlying cause?,Should I have genetic testing to look for a hereditary cause?,What medications are most likely to help my specific type of myoclonus, and what are the side effects?,Is my condition likely to stay stable or get worse over time?,Are there physical therapy or rehabilitation programs that could help me?,What should I do if my jerks suddenly get much worse?,Are there any clinical trials or new treatments being studied for my condition?
Common questions about Rare myoclonus
What is Rare myoclonus?
Rare myoclonus is an uncommon movement disorder characterized by sudden, brief, involuntary muscle jerks or twitches. Myoclonus itself refers to quick, shock-like movements that a person cannot control. In rare forms of myoclonus, these jerks may occur in unusual patterns, affect uncommon body regions, or arise from causes that are not frequently seen. The muscle jerks can happen when a person is at rest, during movement, or in response to a stimulus such as a sudden noise or touch. Myoclonus can affect one muscle, a group of muscles, or multiple areas of the body. It may interfere with walki
Are there clinical trials for Rare myoclonus?
Yes — 1 recruiting clinical trial is currently listed for Rare myoclonus on UniteRare. See the clinical trials section on this page for phase, sponsor, and site details sourced from ClinicalTrials.gov.
Which specialists treat Rare myoclonus?
1 specialists and care centers treating Rare myoclonus are listed on UniteRare, sourced from ClinicalTrials.gov principal investigators, published research, and the NPPES NPI registry.