Prevention before illness means taking various measures to prevent the occurrence of diseases before illness. Prevention before illness includes: (1) keeping healthy and strengthening healthy qi, and its measures mainly include: ① conforming to nature; (2) nourish the mind; ③ Protecting kidney and essence; ④ Physical exercise; ⑤ Conditioning diet; ⑥ Acupuncture, massage, drug conditioning, etc. (2) To prevent the invasion of diseases and pathogens, the main measures are as follows: ① to avoid their pathogens; ② Drug prevention to prevent pathogen damage.