Pressing pain on the left side of the navel may be caused by intestinal diseases, urinary system diseases, abdominal muscle injury, and gynecological diseases. 1. Intestinal diseases: such as irritable bowel syndrome, acute enteritis, ulcerative colitis, colonic tumors, etc., can cause pain, and pressing the left side of the abdomen with the hand, resulting in increased pain. 2. Urological diseases: such as inflammation of the left ureter, stones, can cause left abdominal discomfort, urination abnormalities. Pressing the left side of the abdomen with the hand causes pain at the site of inflammation and at the site of stone impaction. 3. Abdominal muscle injury: the left side of the abdominal muscle due to trauma, cold or strenuous exercise may cause pain or pressure pain. 4. Gynecological diseases: for women, if there are gynecological diseases, such as adnexitis, pelvic effusion, left ovarian cysts, left salpingitis, can also lead to left abdominal pain and discomfort. There are many causes of pain on the left side of the navel when pressed, and it is recommended to clarify and treat it under the guidance of a doctor.