1.What is chronic wound The wound formed by various reasons fails to heal after more than one month of regular treatment, and there is no tendency to heal. 2.Epidemiology of chronic wounds Nearly 1-2% of people will suffer from leg ulcers in their lifetime. 3.What are the causes of chronic wounds Peripheral vascular disease, trauma scarring and infection. Factors affecting wound healing include diabetes, neuropathy, malnutrition, advanced age, and stress, infection, etc. 4, chronic wound treatment prerequisites – wound assessment, including (1) cause; (2) site, size; (3) pain; (4) previous diagnosis and treatment results; (5) medication history; (6) surgical history; (7) family history, etc. 5, what is the harm of chronic wounds If not treated in a timely manner, it is easy to cause the deterioration of the primary disease, which seriously affects the recovery and quality of life of the patient’s primary disease, and also brings heavy care and economic burden to the family. 6, what is the principle of treatment of chronic wounds The principle of treatment is to clean the wound, remove necrotic tissue, and operate if necessary.