What is Myotonic Dystrophy?

• Myotonic dystrophy is part of a group of inherited disorders called muscular dystrophies. 
• There are two major types of myotonic dystrophy: type 1 and type 2. Their signs and symptoms overlap, although type 2 tends to be milder than type 1. 
• It is the most common form of muscular dystrophy that begins in adulthood 
• Myotonic dystrophy affects at least one in 8,000 people worldwide and effects both males and females equally. 
• About half of those with the disorder show visible signs by their early twenties, but a significant number do not develop clear-cut symptoms until after age 50. 

• Prolonged muscle contractions (myotonia) and the inability to relax certain muscles after use 
• Slurred speech or temporary locking of their jaw 
• Clouding of the lens of the eye (also known as cataracts) 
• Abnormalities of the electrical signals that control the heartbeat 
• In affected men, hormonal changes can lead to early balding and fertility issues. 

References:
Muscular Dystrophies & NMD’s Overview 
Understanding Myotonic Dystrophy