Myotonic Muscular Dystrophy (MMD) is an inherited disease. It is autosomal dominant, meaning that if a person has the illness, either her mother or father must have also been afflicted. In addition to causing a very specific pattern of weakness (lower legs, hands, diaphragm, neck and face) it is multi-systemic, often leading to cataracts, heart arrythmias, swallowing and digestive problems and, sometimes, cognitive or personality issues. Approximately one person in 10,000 will have MMD. The Muscular Dystrophy Association sponsors research to find treatments and a cure for MMD.