Bleeding may be caused by tender local skin, leaving the cupping time too long, or too much fire power during cupping. 1. Tender local skin: the patient may have tender skin or thin body type, a little more fire or leave the cupping time longer will appear bleeding phenomenon. 2. Stay cupping time is too long: stay cupping time is generally 5~15 minutes, and according to the patient’s physical condition, the severity of the disease, age and other factors, according to the development of the time to stay cupping, so it is easy to bleed after a long period of time. 3. Excessive fire power during cupping: the greater the fire power during cupping, the greater the negative pressure generated inside the can, the greater the suction on the skin, for people with thin skin, it is very easy to pull out the blood stasis. Cupping on the large vertebrae may cause itching, pain and other discomforts; cupping is contraindicated for people with serious diseases; cupping is contraindicated for people with obvious bleeding tendency; cupping is contraindicated for people with high fever and convulsions; cupping is contraindicated for people who are overworked, overfed, overfed, overfed, and cupping is contraindicated for women with menstruation period and pregnant women; moreover, bleeding can be wiped with sterilized cotton ball, so don’t be over-worried. Cupping should be carried out by a professional doctor, do not operate on your own to avoid adverse consequences.