Adenoma of the sigmoid colon is a benign disease, but it can develop from adenoma to adenocarcinoma as the adenoma gradually increases in size and grows. In the early stage, when the size of sigmoid adenoma is small, patients usually do not have any specific manifestation, or even no symptoms, and they are only found occasionally during physical examination. When occult blood is found, the item of occult blood is found to be positive. Some patients may also have abdominal pain, weight loss, irregular stools or alternating constipation and diarrhea, so these conditions are all signs of sigmoid adenoma. It is recommended to treat the adenoma as soon as it is detected, and if it becomes cancerous, it may even require surgical removal if necessary.