Male lower abdominal pain but constipation may be functional constipation, gastrointestinal dysfunction, intestinal obstruction and other factors. 1. Functional constipation: it is caused by the weakening of gastrointestinal peristalsis or the uncoordinated movement of the intestinal tract, which can lead to constipation, difficulty in defecation, dryness of feces, and a decrease in the number of defecations, and can be accompanied by symptoms such as bloating and pain in the lower abdomen, and loss of appetite. 2. Gastrointestinal dysfunction: it is a general term for a group of gastrointestinal syndromes with dysfunction of gastrointestinal motility and secretion, which is caused by autonomic dysfunction due to the disorder of higher nerve activity, and can be caused by mental tension, anxiety, stress, and so on, with no histological organic lesions. Abnormal gastrointestinal dynamics can occur, resulting in abdominal pain, constipation and other symptoms. 3. Intestinal obstruction: due to the obstruction of the passage of intestinal contents, abdominal pain, abdominal distension, stopping defecation and exhaustion and a series of symptoms. The treatment of acute intestinal obstruction can be divided into conservative treatment and surgical treatment. Conservative treatment includes fasting, gastrointestinal decompression, and the use of some drugs, such as growth inhibitors and acid-suppressing drugs. If the condition is not relieved by conservative treatment or if strangulation has already appeared, surgery should be performed as soon as possible. Male patients with lower abdominal pain but constipation are advised to go to the hospital and ask the doctor to make a judgment and clarify the cause of the disease.