Myotonic dystrophy is a long-term genetic disorder that affects muscle function.[1] It is a type of muscular dystrophy.[1] Symptoms include gradually worsening muscle loss and weakness.[1] Muscles often contract and are unable to relax.[1] Other symptoms may include cataracts, intellectual disability and heart conduction problems.[1][2] In men, there may be early balding and an inability to have children.[1]