Certain illnesses may cause complications in people with muscular dystrophy. Because the disease commonly causes muscle weakness throughout the body, important internal organs like the heart, lungs, and digestive tract may be weakened. This may lead to more severe complications, even from simple illnesses like the flu. It's recommended that people with muscular dystrophy get the flu vaccination each year in order to help protect themselves from possible complications. If you do get sick, it's important to talk to your doctor to prevent serious complications.