Ten to twenty million children and adolescents in the United States have some form of chronic illness or disability. Chronic refers to a health condition that lasts anywhere from three months to a lifetime.
Muscular dystrophies are genetic muscle disorders which cause progressive muscle weakness. There are more than 40 different types. Symptoms can be present at birth or may not occur until adulthood. Similarly, muscle weakness can progress at different rates. Here's what families need to know.