Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 2, 2026.

A primary care doctor is often the first stop and can order early tests. Most people are also referred to a neurologist, who treats nerve and muscle diseases, or a geneticist, who specializes in inherited conditions. Physical therapists and lung specialists may join the team if breathing is affected.

What it is

Collagen VI related myopathy is a muscle disease caused by problems with a protein called collagen VI, which helps give muscle cells structure and support. When it is missing or does not work right, muscles become weak over time. Doctors sometimes group these conditions under names such as Ullrich congenital muscular dystrophy or Bethlem myopathy, which range from mild to severe.

Symptoms

Muscle weakness is the main symptom, often starting in the hips and shoulders. Some people have loose joints; others develop tight joints called contractures. Skin may heal slowly or scar unusually. In severe forms, breathing muscles can weaken and the spine may curve. Symptoms vary widely, even within families.

Causes and who gets it

This condition is genetic, caused by changes in the COL6A1, COL6A2, or COL6A3 genes. It can be inherited from a parent or appear in a child whose parents do not have it. It affects both males and females and is rare.

How doctors diagnose it

A doctor starts with a physical exam, family history, and blood tests for muscle damage. EMG, MRI, and sometimes a muscle biopsy may be used. Genetic testing from a blood or saliva sample is often the clearest way to confirm the diagnosis.

Treatment

There is no cure, but treatment helps people stay active and comfortable. Physical therapy, stretching, and splints keep muscles and joints working. Some people need braces or a wheelchair over time. Breathing can be monitored with sleep studies and supported with nighttime machines. Regular checkups matter because needs change over time.

When to see a doctor

Anyone with ongoing muscle weakness, frequent falls, trouble climbing stairs, or unusually loose or tight joints should see a doctor. Babies who feel floppy or are slow to meet movement milestones should be checked too. Early evaluation helps doctors find the cause and plan care.

How a direct primary care or concierge doctor fits in

A direct primary care doctor charges a flat monthly fee instead of billing insurance; a concierge doctor usually charges more and often works alongside insurance. Either can spend extra time managing this condition, handling monitoring, labs, imaging, and specialist coordination. For breathing problems, severe weakness, or complex genetic questions, they will refer to a neurologist, geneticist, or lung specialist. For everyday care, many can manage the problem directly.

Common questions

The severe form, Ullrich congenital muscular dystrophy, is considered a muscular dystrophy. The milder form, Bethlem myopathy, is usually called a myopathy. Both come from changes in the same collagen VI genes.

Can exercise help?

Gentle movement and stretching usually help keep joints flexible and muscles as strong as possible. A physical therapist should guide the plan, because too much strenuous exercise can strain weak muscles.

Does it get worse over time?

The mild form often progresses slowly, and some people stay mobile for life. The severe form can progress faster and may affect breathing, so regular monitoring is important.

Sources

  1. NIH Genetic and Rare Diseases Information Center - Bethlem myopathy
  2. NIH Genetic and Rare Diseases Information Center - Ullrich congenital muscular dystrophy

Medical Disclaimer

This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.