Hard lump in left upper abdomen may be caused by intestinal obstruction, colon tumor, stomach cancer, pancreatic pseudocyst and other diseases. 1. Intestinal obstruction: it is usually related to intestinal torsion, intestinal foreign body, fecal blockage, etc. The accumulation of intestinal contents in the intestines can not be discharged, which may lead to hard lumps in the left upper abdomen. If pressed, it will stimulate the intestinal tract and may cause painful symptoms. 2. Colon tumor: due to genetic factors, lifestyle and other factors, patients usually have no obvious symptoms, if the tumor volume is too large, there will be hard lumps in the left upper abdomen, and pressing will stimulate the tumor area of the colon and cause pain. 3. Gastric cancer: when the patient is in advanced stage, it may cause hard lump in left upper abdomen with pressing pain, rough surface and pushing. 4. Pancreatic pseudocyst: when the patient has pancreatic closure insufficiency or pancreatic injury, the phenomenon of cyst may appear, with pressing pain. In addition, various causes of splenomegaly, can also be found in the left epigastric left under the ribs of a blunt round-shaped mass, accompanied by suffocation discomfort. Hard lump in the left upper abdomen with pressing pain may also be related to many diseases, patients should seek medical treatment in time, after a comprehensive examination, clear diagnosis, and take corresponding methods of treatment.