Itchy back after fire cupping may be related to thermal stimulation, excessive cupping strength or too long cupping time, skin allergies. 1. Thermal stimulation: the high temperature of the canister during cupping can lead to vasodilatation of the local skin and increase of exudation of local tissue fluid, which can stimulate the local nerves and cause itchiness. 2. Excessive cupping force or too long cupping time: excessive cupping force or too long cupping time will cause local subcutaneous tissue congestion and edema, compression of subcutaneous nerves, thus inducing itchiness. 3. Skin sensitivity: some individuals are allergic to the material of fire cans, such as porcelain cans and bamboo cans, so when the cans stimulate the skin, it will trigger an immune response, thus inducing skin itching. Therefore, when cupping treatment, should be operated by professional doctors, do not operate by yourself, cupping strength and time should not be too long. If there is an itchy back after cupping, you should go to the hospital in time, and the doctor will issue a treatment plan according to the situation.