The phenomenon of panic, shaking legs and weakness may be physiological reasons, or pathological reasons, such as hypoglycemia, arrhythmia and so on. 1. Physiological reasons: due to the body suffered a major accident or mental stress and lead to neurological disorders, which may appear panic legs shaking and soft phenomenon, which is a normal physiological phenomenon, generally do not need special treatment, if necessary, can be consulted. 2. Pathological causes: (1)Hypoglycemia: due to the plasma glucose level falling below normal, and in a state of prolonged starvation, there may be symptoms such as panic attacks, shaking legs and weakness, accompanied by profuse sweating, change of heart and mind, and so on. (2) Cardiac arrhythmia: The body may experience irregular, fast or slow heartbeat due to abnormalities in the electrical conduction system of the heart, such as paroxysmal supraventricular tachycardia, atrial flutter or atrial fibrillation, etc. If the above symptoms occur and physiological symptoms are ruled out, the body may suffer from heart failure. If the above symptoms occur and physiological causes are ruled out, it is recommended to identify the cause of the disease and actively cooperate with the doctor for treatment.