1. According to a doctor's website, before cupping, check whether there are cracks or air leaks in the can. If the negative pressure is too low, the can will not be adsorbed.
2. When cupping, use a 90% alcohol cotton ball to flash fire, and quickly sweep it in the can for a week to quickly cover the skin. If the alcohol concentration is too low or the operation is too slow, it will not be adsorbed.
3. Different positions of acupoints have different local muscle and bone structures. The muscles of the back and waist are plump and easy to absorb, and can be operated with cans with large bottle mouth diameter, while the muscles near the joints, neck and head and face are not plump enough.