Becker Muscular Dystrophy: Causes, Symptoms, and Treatment
Medically reviewed by Achuta Uppu, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor treats Becker Muscular Dystrophy?
A neurologist, a doctor who treats nerve and muscle diseases, leads care. A heart doctor checks the heart, and physical therapists help with movement. A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.
What is Becker muscular dystrophy?
Becker muscular dystrophy is an inherited condition that causes muscle weakness over time. Inherited means it passes down through families. It mainly affects the muscles you use for movement and the heart muscle. It gets worse much more slowly than a related condition called Duchenne muscular dystrophy.
The condition almost always affects boys. Weakness often first appears between ages 5 and 15, but it can start later.
Symptoms
Muscle weakness starts in the legs and pelvis and slowly gets worse. Common signs include:
- Trouble walking that gets worse over time.
- Frequent falls and trouble getting up from the floor.
- Trouble climbing stairs, running, hopping, and jumping.
- Loss of muscle mass in the legs.
- Tight heel and leg tendons called contractures, which limit movement.
The arms, neck, and shoulders are affected later and less severely. Some people have breathing problems, tiredness, and trouble with balance. Thinking and learning skills may be affected, but those problems do not get worse over time.
The heart muscle can also weaken. This is called cardiomyopathy, a disease of the heart muscle. Signs include shortness of breath, extreme tiredness, an irregular heartbeat, and swelling in the legs and feet.
Causes and who gets it
Becker muscular dystrophy is caused by changes in the DMD gene. This gene makes a protein called dystrophin, which protects muscle fibers as they work. In this condition, the body makes a version of dystrophin that still works partly. Muscles slowly break down without enough working dystrophin.
The changed gene sits on the X chromosome, so mothers carry it and pass it to sons. In some cases the change happens on its own and is not inherited. It occurs in about 1 out of every 18,000 to 30,000 births.
How doctors diagnose it
Doctors start with a muscle and nerve exam and a careful family history. Blood tests can measure creatine phosphokinase, a muscle enzyme that leaks out of damaged muscles. A genetic test looks for changes in the DMD gene.
Other tests include EMG, a test that records electrical activity in muscles, and a muscle biopsy, a small sample of muscle looked at under a microscope. Heart tests such as an echocardiogram and an ECG check how the heart is working.
Treatment
There is no cure yet. Treatment aims to control symptoms and keep quality of life as high as possible.
- Physical therapy helps keep muscle strength and movement. Staying active helps, because bed rest can make muscles weaker.
- Steroid medicines may help some people keep walking longer.
- Braces and wheelchairs can improve movement and daily life.
- Heart care is part of treatment. Guidelines recommend heart medicines called ACE inhibitors, with or without beta-blockers, and the heart doctor decides when to start them. Some people also need a pacemaker or defibrillator, small devices that help the heart beat right.
Research is also testing new medicines for this condition.
When to see a doctor
Contact a doctor if a child has growing muscle weakness or falls often. Call a doctor if someone with this condition has new symptoms, such as a fever with cough. Call 911 or your local emergency number right away for trouble breathing, chest pain or discomfort lasting two minutes or more, fainting, or sudden weakness or trouble speaking. Talk to a doctor before starting a family if the condition runs in your family.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance, while a concierge doctor usually charges more and often works alongside insurance. This doctor can track symptoms over time, order blood tests, and coordinate care with neurologists and heart doctors.
Common questions
Is Becker muscular dystrophy the same as Duchenne muscular dystrophy?
No. They are related conditions caused by changes in the same gene. Becker muscular dystrophy is milder. Symptoms start later and get worse much more slowly than in Duchenne muscular dystrophy.
Does Becker muscular dystrophy affect the heart?
Yes. The heart muscle can weaken over time and lead to cardiomyopathy. Doctors check the heart regularly with tests like an echocardiogram and an ECG.
How is Becker muscular dystrophy passed down?
Mothers carry the changed gene on the X chromosome and can pass it to their sons. Daughters of a man with the condition will very likely carry the changed gene too.
Can people with Becker muscular dystrophy live a long life?
Many people live into their forties or beyond. Life is often shorter when the heart or breathing muscles are weak.
Sources
- MedlinePlus Genetics - Duchenne and Becker muscular dystrophy
- MedlinePlus - Becker muscular dystrophy
- PubMed Central - Current and emerging therapies in Becker 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.
