The long hard lump in the left lower abdomen is oblique may be caused by constipation, hernia, lipoma and other reasons. 1. Constipation: If the patient’s diet is not reasonable, there may be dry stools, so the food will accumulate in the intestines for a long time, and long hard lumps may appear in the abdomen. 2. Hernia: when the patient suffers from hernia, the pressure in the abdominal cavity will be increased, and the content may protrude from the weak point, so hard lumps may appear in the groin area. 3. Lipoma: Lipoma is a kind of common benign tumor, if the patient suffers from lipoma, the fat cells in the body may form cystic lumps, which are usually found in the abdominal cavity, thoracic cavity, pelvic cavity and other places. It is recommended that patients should go to the hospital for relevant checkups in time when they are not feeling well, so as to avoid delaying their condition.