Pain in the body without stimulation by external factors is considered: 1. local ischemia and hypoxia due to cardiovascular disease. 2. lesions in peripheral nerves. 3. the initial stage of herpes zoster (pain is distributed along the nerve line, pain lasts about 3 days, blisters will appear on the affected area, you can rub the affected area with acyclovir ointment and take oral ganciclovir capsules). It is recommended to do electrocardiogram, cardiac ultrasound, electromyogram, etc. in hospital and treat the symptoms according to the examination results. Do not eat spicy and irritating food during the treatment period, keep your mood relaxed and do not stay up late.