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Living with Hereditary inclusion body myopathy type 4

A rare inherited muscle condition with slowly worsening weakness, starting in the hips and thighs, in adulthood.

Understanding Hereditary inclusion body myopathy type 4

Hereditary inclusion body myopathy type 4 is a rare muscle disease with slowly worsening weakness and muscle wasting.

Weakness first affects the upper legs and hips, and later the shoulders, upper arms, and trunk. Walking is usually preserved. It is non-dystrophic, meaning it differs from muscular dystrophy. A muscle biopsy shows distinct deposits inside muscle cells. It begins in adulthood.

Signs & symptoms

GARD doesn't list specific symptoms for this condition yet. Based on the summary, it can include:

  • Slowly worsening muscle weakness
  • Muscle wasting (atrophy)
  • Weakness in the upper legs and hips
  • Weakness later in shoulders and upper arms

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 rare disease patient organizations for support
  • 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
Could genetic testing help confirm my diagnosis?
What therapies help keep me walking and strong?
How often should my muscle strength be checked?

Quick facts

Symptoms usually startAdult
InheritanceAutosomal Dominant

GARD says changes in genes (also called variants) cause this condition. It is autosomal dominant, so one changed copy of the gene is enough.

GeneticNeurological

Also known as: hibm4

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Hereditary inclusion body myopathy type 4GARD ID 21440 · 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 Hereditary inclusion body myopathy type 4.

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