一位同学常在跑步、跳绳等活动之后感觉四肢无力，经短时间休息后又可好转。他以为是缺乏锻炼，因此就加强锻炼，但不见任何效果，甚至发展到洗脸、梳头都很困难。父母带他就诊，才知他得了重症肌无力。还有一位小朋友，发现自己看电视时眼皮会掉下来，只好用手掰开眼皮继续看 A classmate often feel limbs after running, jumping rope and other activities weakness, after a short break can be improved. He thought it was a lack of exercise. Therefore, he was able to exercise more. However, he did not see any result and even developed his face and hair. Parents took him to see him, I learned that he had myasthenia gravis. There is also a child, found himself watching eyelids will fall, had to break his eyelid to continue to see