I have rheumatoid arthritis. I bled with a plum blossom needle and the water came out. What is the reason?

Bloodletting therapy is one of the acupuncture methods, that is, the pricking collateral method in Neijing. According to different situations, a "triangular needle" is used to puncture superficial blood vessels in specific parts of the human body to release appropriate amount of blood, so as to achieve the purpose of treatment by promoting blood circulation and regulating qi. Bloodletting therapy has played an important role in the treatment of diseases. Ancient physicians attached great importance to bloodletting therapy. Plum blossom needle bloodletting produces water. This symptom is qi stagnation and blood stasis, accompanied by cold.