Muscular dystrophy is a general concept and a symptom, because normal people have obvious muscle mass and muscle capacity. The number of muscles, just like the number of muscle cells in muscle fibers, is the size of muscle cells. If muscle cells decrease or muscle capacity decreases, this situation is called muscular dystrophy, which is caused by many reasons, depending on the specific reasons. It is physiological, such as long-term bed rest and lack of activity, and the weight of his limbs muscles can be reduced, which is called physiological atrophy. There are also pathological atrophy, such as muscle inflammation, a large number of muscle cells necrosis, cell number reduction. This is pathological muscular atrophy, depending on the specific situation. Muscle atrophy refers to the decrease of muscle volume caused by malnutrition of striated muscle and thinning or even disappearance of muscle fibers. The main reasons are neurogenic muscular atrophy, myogenic muscular atrophy, disuse muscular atrophy and other reasons. Muscle atrophy (muscle atrophy; Myophagia) refers to the muscle volume reduction caused by rhabdomyodystrophy and the thinning or even disappearance of muscle fibers. Mostly caused by muscle diseases or nervous system dysfunction, the main reasons are: neurogenic muscular atrophy, myogenic muscular atrophy, disuse muscular atrophy and other causes of muscular atrophy. The nutritional status of muscle is closely related to the nervous system besides the pathological changes of muscle tissue itself. Spinal cord diseases often lead to muscular dystrophy and muscular atrophy. Patients with muscular atrophy stay in bed for a long time due to muscular atrophy and myasthenia, and are prone to pneumonia and pressure ulcers. And most patients have symptoms of bulbar palsy, which poses a great threat to patients' lives.