Constipation is not a disease, but often a symptom of some disease that is manifested. Therefore do not be fooled by the manifestation of constipation, some constipation is very dangerous and should be particularly alert. Let’s see which constipation needs attention: 1. Patients above middle age should be alert to colon cancer if their bowel habits have changed or if they have progressive constipation. 2.For acute constipation with vomiting, abdominal distension and intestinal colic, intestinal obstruction should be considered. 3, constipation with chronic abdominal pain, with a history of lead exposure, may be chronic lead poisoning. 4.Constipation alternating with diarrhea with abdominal pain is commonly associated with intra-abdominal tuberculosis, colon tumor, and chronic ulcerative colitis. 5, fecal masses are small, segmented in the shape of sheep feces, often due to colonic spasm or irritable bowel syndrome. 6, constipation with abdominal masses must pay attention to intestinal obstruction, intussusception, intestinal tumors, pelvic tumors, abdominal tuberculosis, etc. 7, such as patients with a long history of constipation, and no other discomfort and positive signs, age in middle age or older, may be habitual constipation. In short, we should change the past attitude towards constipation, do not think it is a trivial matter, long-term constipation on the human body is not small, if suffering from constipation should be early examination and treatment.