It may be due to autonomic dysfunction, hypoglycemia and other factors. It is recommended that the patient go to the hospital to clarify the cause of the disease. 1. Autonomic dysfunction: it may be due to excessive shock that leads to autonomic dysfunction, mainly due to the balance of the autonomic nervous system is broken, so there will be symptoms of lack of energy after being shocked, then you should lie down on the bed and rest, and if necessary, you can inhale oxygen to alleviate the situation. 2. Hypoglycemia: in the process of being frightened, endocrine dysfunction may lead to hypoglycemia, and hypoglycemia itself will cause pallor, weakness and sweating and other symptoms. 3. neurasthenia: mainly due to prolonged overwork, mental stress and other causes of cerebral nerve center dysfunction, mental exhaustion. Psychasthenia is aggravated after being frightened, thus causing the symptoms of lack of energy. Sufferers in daily life in daily life, patients should relax, maintain optimism, eat a light diet, avoid spicy and stimulating food, and ensure balanced nutrition.