Oral, esophageal and colonic ulcers may be caused by lack of trace elements, inflammation, tumors, etc., and need to be analyzed specifically. 1. Lack of micronutrients: If the body lacks micronutrients, it will lead to the destruction of the mucous membrane barrier, triggering multiple ulcers. At this time, you can eat more fresh fruits and vegetables to supplement the trace elements. 2. Inflammation: if the digestive tract is infected by bacteria and other microorganisms, it is easy to stimulate the mucous membrane, triggering local inflammation and causing ulcers, and the inflammation can be improved after the infection is removed. 3. Tumor: if there are oropharyngeal cancer, esophageal cancer, colon cancer and so on, the cancer cells will damage the local tissues, which will be manifested as ulcers in the early stage of the disease. When patients have ulcers in many parts of the mouth, esophagus and colon, they should keep vigilance and go to hospital in time to determine the cause of disease formation, carry out pathological biopsy if necessary, and carry out treatment according to the cause of the disease under the guidance of doctors, so as to promote the improvement of symptoms.