Most patients with sigmoid colon cancer do not have obvious clinical symptoms in the early stage, and a few patients are more sensitive to the disease and may feel loss of appetite and mild stomach pain. Sigmoid colon cancer is a type of colon cancer and the cancer foci occur in the sigmoid colon area. In the early stage, due to the small lesion and narrow invasion range, no infiltration occurs, usually there are no obvious symptoms, which can be easily neglected; however, the individual’s physique and sensitivity to the disease are different, and there are also a few patients who may feel loss of appetite and slight stomach pain in the early stage of the disease, which are often misdiagnosed as other gastrointestinal diseases. With the gradual progress of the disease, patients with sigmoid colon cancer will feel obvious symptoms such as stomach pain, flatulence and blood in feces. The earlier the sigmoid colon cancer is treated, the better the prognosis is. Once you have any uncomfortable symptoms, you should consult the doctor in time, find out the cause and cooperate with the doctor for treatment. For people with high risk of sigmoid colon cancer, such as family history, high-fat diet, constipation patients, etc., they should have regular colonoscopy.