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Living with Severe congenital nemaline myopathy

A severe muscle condition from birth with very low muscle tone, little movement, and breathing and swallowing trouble.

Understanding Severe congenital nemaline myopathy

Severe congenital nemaline myopathy is a severe form of nemaline myopathy that shows at birth with very low muscle tone.

Newborns have severe low muscle tone (hypotonia) and move very little on their own. It can bring breathing trouble, swallowing trouble, and stiff joints. Signs may start before birth, such as reduced fetal movement. It begins in the newborn and infant period.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Severe low muscle tone in newborns
  • Little spontaneous movement
  • Breathing difficulties
  • Trouble swallowing
  • Stiff, bent joints (contractures)
  • Reduced movement before birth

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include brain and nervous system specialists and genetic specialists.

  3. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

Care & treatment

Care team
Brain and nervous system specialists (neurologists); Genetic specialists (geneticists)
Expert care
Ask about multidisciplinary care centers for rare conditions
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with A Foundation Building Strength
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
Should we have genetic testing to find the gene involved?
What breathing and feeding support might help?
What physical therapy can help my child?

Quick facts

Symptoms usually startNewborn and as an Infant
InheritanceAutosomal Recessive

GARD says it is inherited in an autosomal recessive way, so a child inherits a changed copy of a gene from each parent. It does not name a gene in this record.

GeneticNeurological

Patient organizations

Source: NIH GARD · Severe congenital nemaline myopathyGARD ID 12821 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Severe congenital nemaline myopathy.

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