Diarrhea for nearly 2 months, today the stool is a little dry hard to solve, mostly considered to be constipation and diarrhea alternately, wiping the blood on the paper, may be the presence of intestinal bleeding, whether the need for enteroscopy recommended to consult a doctor before making a decision. Constipation and diarrhea alternating may be chronic enteritis, irritable bowel syndrome, gastrointestinal dysfunction, inflammatory bowel disease, intestinal tumors and other diseases. These lesions may cause bleeding in the intestines and blood on the paper when wiping the buttocks. Patients should be examined in the hospital when they experience diarrhea alternating with constipation and bleeding. Whether a patient needs a colonoscopy should be analyzed on a case-by-case basis and cannot be generalized. If it is due to the presence of pathogens in the intestinal tract due to chronic infection, can be through the stool routine or stool culture and other tests to determine, usually do not need to carry out colonoscopy. However, if it is not due to infection and no specific cause can be found, enteroscopy should be considered to determine whether it is due to inflammatory bowel disease or intestinal tumors and other organic lesions of the intestinal tract, and biopsy can also be carried out on the suspected areas to determine the nature of the lesions. If the patient has constipation and diarrhea alternating with bleeding, it is recommended to consult a doctor in time and decide whether or not to carry out enteroscopy under the guidance of the doctor, so as to find out the cause of the disease as soon as possible and carry out targeted treatment to avoid delaying the condition.