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Genetic and Rare Diseases Information Center (GARD)

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Myotonic dystrophy type 2

Other Names for this Disease
  • DM2
  • Dystrophia myotonica type 2
  • Myotonic myopathy, proximal
  • Proximal myotonic myopathy
More Names
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What are the signs and symptoms of myotonic dystrophy type 2?

Myotonic dystrophy type 2 is characterized by progressive muscle wasting and weakness. Symptoms typically begin in a person's twenties. People with this condition often have prolonged muscle contractions (myotonia) and are not able to relax certain muscles after use. For example, a person may have difficulty releasing their grip on a doorknob or handle. Also, affected people may have slurred speech; temporary locking of their jaw; and muscle pain and weakness that mainly affects the neck, shoulders, elbows, and hips. Less common symptoms include abnormalities of the electrical signals that control the heartbeat (cardiac conduction defects); clouding of the lens in the eyes (cataracts); and diabetes. Males may experience balding and infertility. The severity of symptoms varies among affected people. Compared to myotonic dystrophy type 1, type 2 is milder and does not necessarily shorten a person's lifespan.[1][2]
Last updated: 2/10/2014

  1. Myotonic dystrophy. Genetics Home Reference (GHR). November 2010; Accessed 5/11/2011.
  2. Dalton JC, Ranum LPW, Day JW. Myotonic Dystrophy Type 2. GeneReviews. April 23, 2007; Accessed 4/8/2012.