Upper left abdominal mass is not necessarily cancer. Many diseases other than cancer can be manifested as upper left abdominal mass, such as splenomegaly, intestinal obstruction, subcutaneous lipoma and so on. 1. Splenomegaly: left upper abdominal mass is mostly described by physical examination, spleen is located in the left upper abdomen, patients with splenomegaly can find left upper abdominal mass during physical examination by doctor, sometimes patients can also feel left upper abdominal mass by themselves, splenomegaly is commonly found in patients with cirrhosis of the liver, autoimmune diseases and so on. 2. Intestinal obstruction: some patients with intestinal obstruction can also find a mass in the left upper abdomen, which is often a localized accumulation of feces or gas, and can be seen in patients with a history of multiple abdominal surgeries or Crohn’s disease. 3. Subcutaneous lipoma: subcutaneous lipoma of a certain size can also be manifested as a left upper abdominal mass, and lipoma is a benign tumor, not cancer. Lipoma is a benign tumor, not cancer. Therefore, it is not necessarily cancer, and it is recommended that the patient should improve the examination and make a clear diagnosis under the guidance of the doctor.