A hard lump on the left side of the abdomen is painful when pressed, which may be caused by fecal accumulation, hernia, intestinal tumors and so on. 1. Fecal accumulation: generally considered to be the sigmoid colon with residual feces, if the patient’s abdominal wall is relatively thin, sometimes can be felt through the abdomen strips of hard lumps press, will feel pain. 2. Hernia: when some patients suffer from hernia, it often leads to a lump in the left lower abdomen and groin area, especially when the abdomen is hard, it will feel hard when pressed, and the lump will be reduced after lying down. 3. Intestinal tumors: including benign tumors and malignant tumors, if occurring in the sigmoid colon area, it will be manifested as a lump in the left lower abdomen, and it will be painful when pressing. If there is a hard lump on the left side of abdomen with pressing pain, it may be caused by other reasons, such as posterior peritoneal tumor, if the symptoms can not be relieved after defecation, it is necessary to consult the doctor in time, and cooperate with the doctor to take examination and treatment.