Yellow water from cupping may be caused by oozing tissue fluid, burns, etc. Normal cupping will not produce yellow water. Cupping is a kind of traditional Chinese medical treatment which takes can as a tool, uses fire and pumping to produce negative pressure, adsorbs it on the body surface and causes local blood stasis, so as to achieve the effect of activating the meridians and collaterals, promoting qi and blood circulation, eliminating swelling and relieving pain, and dispelling wind and cold. 1. Tissue fluid: yellow water exists in the cellular space, when cupping, the pores of the body are open, due to the strong adsorption capacity of the can, so some tissue fluid will be adsorbed from the cellular space. 2. Scald: When cupping, the temperature of the mouth of the can is too high or the cupping time is too long, resulting in the loss of the protective layer of the skin surface, resulting in scalding, leading to yellow water oozing out. If this is the case, then immediately stop cupping. If yellow water appears in cupping, you need to seek medical treatment in time.