Lateral developmental tumors of the transverse colon are serious. Lateral developmental tumor of transverse colon is a kind of flat and elevated lesion that occurs in the mucosa of colon, once sick, the tumor may block the intestinal tract, which leads to intestinal obstruction and pain, at the same time, this kind of tumor may also metastasize to the liver, lungs and other parts of the body, which may endanger the life of the patient in case of seriousness, therefore, the lateral developmental tumor of transverse colon is more serious. Once patients are diagnosed with lateral developmental tumor of transverse colon, they need to go to regular hospitals for consultation immediately. Clinically, surgery can be adopted for resection treatment, and at the same time, chemotherapy and radiotherapy can also be used as adjuvant treatments, so that a two-pronged approach can achieve good results. Patients are advised to go to the hospital for regular checkups, and if there is any abnormality, timely treatment should be given to avoid aggravation of the condition and endangerment of life.