What are the types of muscular dystrophy?

There are more than 30 forms of muscular dystrophy (MD), with information on the primary types included in the table below.1

Duchenne (DMD)
What It Is Common Symptoms How It Develops
The most common and severe form of MD among children, DMD accounts for more than 50% of all cases. DMD is caused by a deficiency of dystrophin, a protein that helps strengthen muscle fibers and protect them from injury.2 Weakness begins in the upper legs and pelvis. People with DMD may also:
  • Fall down a lot
  • Have trouble rising from a lying or sitting position
  • Waddle when walking
  • Have difficulty running and jumping
  • Have calf muscles that appear large because of fat accumulation
DMD appears typically in boys between ages 3 and 5 and progresses rapidly. Most people with DMD are unable to walk by age 12 and may later need a respirator to breathe. They usually die in their late teens or early 20s from heart trouble, respiratory complications, or infection.
What It Is Common Symptoms How It Develops
Also caused by a deficiency of dystrophin, and with symptoms similar to those of DMD, Becker can progress slowly or quickly. Patients with Becker MD may:
  • Walk on their tiptoes
  • Fall down a lot
  • Have difficulty rising from the floor
  • Have cramping in their muscles
Becker MD appears primarily in males between ages 11 and 25. Some people may never need to use a wheelchair, while others lose the ability to walk during their teens, mid-30s, or later.
Myotonic (pronounced mahy-uh-TON-ik)
What It Is Common Symptoms How It Develops
The most common adult form of MD, myotonic MD appears in two forms, type 1 and type 2. Type 1 is more common and is caused by an abnormally large number of repeats of a three-letter "word" (CTG) in genetic code. While most people have up to 37 repeats of CTG, people with myotonic can have up to 4,000. The number of repeats may reflect the severity of symptoms.3 Myotonic MD causes an inability to relax muscles following a sudden contraction. Other symptoms include
  • Long, thin face and neck
  • Swallowing difficulties
  • Drooping eyelids, cataracts, and other vision problems
  • Baldness at the front of the scalp
  • Weight loss
  • Increased sweating
  • Drowsiness
  • Heart problems that may lead to death during the 30s or 40s
  • Irregular menstrual periods
  • Infertility
  • Impotence
Myotonic MD affects both men and women between ages 20 and 30.
Congenital (pronounced kuhn-JEN-i-tl)
What It Is Common Symptoms How It Develops
About half of all U.S. cases with congenital MD are caused by a defect in the protein merosin, which surrounds muscle fibers. When caused by defects in other proteins, this type of MD may also affect the central nervous system.4 People with congenital MD may:
  • Have problems with motor function and muscle control that appear at birth or during infancy
  • Develop chronic shortening of muscles or tendons around joints, which prevents joints from moving freely
  • Develop scoliosis (pronounced skoh-lee-OH-sis) (curvature of the spine)
  • Have trouble breathing and swallowing
  • Have foot deformities
  • Have intellectual disabilities
This form of MD appears at birth or by age 2. Congenital means "present from birth." Congenital MD affects both boys and girls, who often require support to sit or stand and may never learn to walk. Some patients die in infancy, but others live into adulthood with only mild disability.
What It Is Common Symptoms How It Develops
Affecting boys primarily, the two forms of Emery-Dreifuss MD are caused by defects in the proteins that surround the nucleus in cells.5 Weakness begins in the upper arm and lower leg muscles. People with this form may also
  • Develop chronic shortening of muscles around joints (preventing them from moving freely), in the spine, ankles, knees, elbows, and back of the neck
  • Have elbows locked in a flexed position
  • Develop shoulder deterioration
  • Have a rigid spine
  • Walk on their toes
  • Experience mild weakness in their facial muscles
Symptoms usually begin by age 10 but can appear in patients up to their mid-20s. People with this form often develop heart problems by age 30, and they may die in mid-adulthood from progressive pulmonary or cardiac failure.
Facioscapulohumeral (FSHD; pronounced fas-see-oh-skap-you-low-HEW-mur-l)
What It Is Common Symptoms How It Develops
FSHD refers to the areas affected: the face (facio), the shoulders (scapulo), and the upper arms (humeral). Researchers don't know what gene causes FSHD. They do know where the defect occurs and that it affects specific muscle groups.6 FSHD MD often appears first in the eyes (difficulty in opening and shutting) and mouth (inability to smile or pucker).7 Other symptoms may include
  • Muscle wasting that causes shoulders to appear slanted and shoulder blades to appear "winged"
  • Impaired reflexes only at the biceps and triceps
  • Trouble swallowing, chewing, or speaking
  • Hearing problems
  • Swayback curve in the spine, called lordosis (pronounced lawr-DOH-sis)
FSHD affects teen boys and girls typically but may occur as late as age 40. Most individuals have a normal life span, but symptoms can vary from mild to severely disabling.
What It Is Common Symptoms How It Develops
Affecting both males and females, different types of limb-girdle are caused by different gene mutations. Patients with limb-girdle inherit a defective gene from either parent, or, in the more severe form, the same defective gene from both parents.5 Patients with limb-girdle MD may:
  • First develop weakness around the hips, which then spreads to the shoulders, legs, and neck
  • Fall down a lot
  • Have trouble rising from chairs, climbing stairs, or carrying things
  • Waddle when they walk
  • Have a rigid spine
This form of MD can appear in childhood but most often appears in adolescence or young adulthood. Limb-girdle can progress quickly or slowly, but most patients become severely disabled (with muscle damage and inability to walk) within 20 years of developing the disease.
What It Is Common Symptoms How It Develops
Distal MDs refer to a group of diseases that affect the muscles of the forearms, hands, lower legs, and feet. They are caused by defects in the protein dysferlin5 and can occur in both men and women. Distal MD may cause:
  • Inability to perform hand movements
  • Difficulty extending fingers
  • Trouble walking and climbing stairs
  • Inability to hop or stand on the heels
This form typically appears between ages 40 and 60. Distal MD is less severe and progresses more slowly than other forms of MD, but it can spread to other muscles. Patients may eventually need a ventilator.
Oculopharyngeal (pronounced ah-kyou-low-fuh-RHIN-ghee-l)
What It Is Common Symptoms How It Develops
This form occurs in both men and women, and it can be mild or severe. It is caused by a defect in a protein that binds to molecules that help make other proteins. It is common among Americans of French-Canadian descent, Jewish Ashkenazi, and Hispanics from the Southwest region.8 Oculopharyngeal MD may cause:
  • Drooping eyelids and other vision problems
  • Swallowing problems
  • Muscle wasting and weakness in the neck, shoulders, and sometimes limbs
  • Heart problems
This form of MD typically appears in a person's 40s or 50s. Some people will eventually lose their ability to walk.



  1. National Institute of Neurological Disorders and Stroke (NINDS). (2011). Muscular dystrophy: Hope through research. Retrieved May 25, 2012, from ttps://www.ninds.nih.gov/Disorders/Patient-Caregiver-Education/Hope-Through-Research/Muscular-Dystrophy-Hope-Through-Research
  2. Darras, B. T., Miller, D. T., & Urion, D. K. (2011). Dystrophinopathies. In R. A. Pagon, T. D. Bird, & C. R. Dolan, et al. (Eds.), NCBI gene reviews. Seattle: University of Washington. Retrieved June 21, 2012, from http://www.ncbi.nlm.nih.gov/books/NBK1119/
  3. Myotonic Dystrophy Foundation. (n.d.). Genetics of DM. Retrieved July 17, 2012, from http://www.myotonic.org/what-dm/disease-mechanism External Web Site Policy
  4. Sparks, S., Quijano-Roy, S., Harper, A., Rutkowski, A., Gordon, E., Hoffman, E. P., et al. (2012). Congenital muscular dystrophy overview. In R. A. Pagon, T. D. Bird, C. R. Dolan, et al. (Eds.), NCBI Gene Reviews, Seattle: University of Washington. Retrieved June 25, 2012, from http://www.ncbi.nlm.nih.gov/books/NBK1291/
  5. NIH Muscular Dystrophy Interagency Coordinating Committee. (2004). Muscular dystrophy research and education plan for the National Institutes of Health. Retrieved June 25, 2012, from http://join.parentprojectmd.org/site/DocServer/filename?docID=153 (PDF - 8.47 MB)
  6. NIH Muscular Dystrophy Coordinating Committee. (2005). Action plan for the muscular dystrophies. Retrieved June 21, 2012, from https://www.mdcc.nih.gov/action-plan
  7. FSH Society. (n.d.). What is FSHD disease? Retrieved June 25, 2012, from https://www.fshdsociety.org/what-is-fshd/ External Web Site Policy
  8. Brais, B., & Rouleau, G. A. (2006). Oculopharyngeal muscular dystrophy. Oculopharyngeal muscular dystrophy. In R. A. Pagon, T. D. Bird, C. R. Dolan, et al. (Eds.), NCBI Gene Reviews. Seattle: University of Washington. Retrieved June 25, 2012, from http://www.ncbi.nlm.nih.gov/books/NBK1126/

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