Hi and welcome to HCM. Thank you for your querry If you mean MG like myashenia gravis then I can answer your questions: 1.Myasthenia Gravis (MG) is a neuromuscular autoimmune disease that affects the use of muscles - normal communication between the nerve and the muscle is interrupted, leaving the muscle weak and fatigued.It is not curable but it is treatable. It is very serious disease but today there are ceratin medicines which can help a lot. This is not infectious disease. It is geneticaly determined and caused by autoimmune mechanisms.It has nothnig with cancer or enviromental factors. With MG, it is the voluntary (striated) muscles that are weakened. Voluntary muscles are the muscles that we can control, where the message is transmitted via our nervous system to contract the muscle. They are the muscles in our legs, our arms and our neck; those that move the eyeball and keep the eyelids open; some of those involved with facial expression, and those involving chewing, swallowing and breathing. MG does not affect bowel and bladder function. The onset of MG may be sudden, with severe and generalised muscle weakness, but more often the symptoms in the early stages are subtle and variable, making it difficult to diagnose correctly. Some have only ocular myasthenia involving the eye muscles and eyelids; others have mainly swallowing difficulties or slurred speech; others have generalised MG affecting many muscle groups. The severity varies at different times of the day, and from person to person. Consequently, a person with MG experiences phases of muscular weakness that alternate with periods of normal health. So for further info ask your neurologist. Wish you good health.