Middle-aged and elderly people are weak and their immunity declines, which is easy to cause many diseases. Chinese medicine attaches great importance to helping the healthy qi of the human body and strengthening people's ability to resist diseases, thus reducing the occurrence of diseases and prolonging life, that is, preventing problems before they happen. Clinically, influenza, rhinitis, cough, allergic dermatitis, asthma, peptic ulcer and other diseases are all related to the decline of immunity. Because the early symptoms of decreased immunity are not obvious, it is difficult to be detected by people. Once the body has obvious diseases, it means that the immunity is greatly reduced, which will bring great difficulties to the treatment of diseases and the rehabilitation of patients. Human immunity is the same as healthy qi in traditional Chinese medicine. The method of strengthening the body resistance and eliminating pathogenic factors in traditional Chinese medicine has a good effect on enhancing immunity and preventing and treating diseases. Deficiency of both qi and blood, palpitation and insomnia, fatigue and sores in the mouth and tongue can be treated by supplementing qi and nourishing blood, oral Buxin Dan and other Chinese patent medicines. Liver yin deficiency, bilateral swelling and pain, dysphoria and indigestion can be treated by soothing liver and nourishing yin, taking Shugan Pill and Tiaowei Pill orally. People with lung qi deficiency, chest tightness, cough, shortness of breath, and easy to catch a cold should be treated with lung-tonifying method, oral lung-tonifying drink, Qingfei pill, etc. Kidney deficiency, soreness of waist and knees, aversion to cold in limbs and frequent urination should be treated with the method of tonifying kidney and strengthening yang can, and Dihuang pill and Ganoderma lucidum pill should be taken orally.

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