Professor Cao Jianxiong believes that the main causes of elderly constipation are deficiency of yang qi, deficiency of yin and fluid, and the combination of dampness, food, phlegm, heat and blood stasis. The first treatment is to distinguish the deficiency and the truth, and then to distinguish the cold and heat. In the process of diagnosis and treatment, Professor Cao Jianxiong stressed and paid attention to the treatment based on syndrome differentiation, made good use of the prescription, flexibly mixing drugs, and paid attention to the imp...