There is a hard lump in the left lower abdomen, hidden swelling, male, may be due to intestinal fecal hardness, intestinal tumors or inguinal hernia and other reasons. 1. Intestinal fecal calculus: hard lumps in the left lower abdomen, in fact, most of the cases are the residual feces in the sigmoid colon, there are secretions in the stool, in the case of the patient’s thin abdominal wall, it is sometimes easy to feel the stripes of hard lumps, there may be a slight sense of distension and pain when pressing, as long as the stool is emptied, the symptom will also disappear naturally. 2. Intestinal tumors: As the sigmoid colon is prone to malignant tumors, there will be abdominal mass, if the mass is large, it can also be palpated, which can be manifested as pain, blood in the stool, increase in the number of stools, and change in the nature of stools, and it can be treated by a combination of surgery, chemotherapy (5-FU, furacil, etc.), and radiotherapy according to the nature of the mass. 3. Inguinal hernia: the typical symptom is a prominent and reproducible mass in the inguinal area. At first, the lump is small, only a slight feeling of swelling, as the lump is getting bigger and bigger, the patient will have pain symptoms. Surgery is the preferred treatment after diagnosis. Appearance of the left lower abdomen hard pressure found a hard lump, hidden swelling, regardless of men and women, it is recommended to go to the hospital in time for consultation, after clarifying the cause of the disease, according to the doctor’s guidance for standardized treatment.