Myocarditis well, leg weakness may be the general condition has not yet recovered is a normal phenomenon, but also may be turned into chronic myocarditis, neurological diseases and so on. 1. Systemic condition has not yet recovered: most of the myocarditis in its symptoms before the occurrence of viral infections, viral infections can be manifested as sore throat, muscle aches and pains, etc., when myocarditis is well, when the patient’s systemic condition has not yet been restored, the patient may have the symptoms of weakness of the legs, which is a normal phenomenon, and rest for a period of time will be recovered by itself. 2. Chronic myocarditis: If myocarditis patients’ symptoms improve, but the later development of chronic myocarditis, myocardial ischemia, insufficient blood supply to the whole body, patients may show symptoms of leg weakness. 3. Neurological diseases: when the patient’s myocarditis is well, the leg is still weak, the patient should go to the hospital in time to do electromyography and other tests to diagnose the existence of neurological diseases, such as spinal muscular atrophy. When the patient’s myocarditis is well and the legs are weak, he should go to the hospital in time for relevant examination and active treatment of the pathological causes.