A hard lump below the left rib cage can be seen in the following cases: First, diseases occurring in the abdominal organs, commonly of gastric tissue origin, including gastric ulcer disease or gastric tumors, specifically sarcoma as well as gastric cancer, in which the patient will experience significant pain, loss of appetite, weight loss, which will also lead to worsening of symptoms after eating, accompanied by anemia, and should be promptly examined by gastroscopy. For patients with early diagnosis, surgery should be actively chosen, and regular follow-up and observation are needed after surgery, or adjuvant intravenous chemotherapy should be administered to prevent recurrence and metastasis. Secondly, diseases occurring in the abdominal wall are commonly benign, including fibroids or lipomas, etc. They can also be simple cysts, the main symptom of which is a local bulging mass, which can also be accompanied by painful manifestations. They can be surgically removed under local anesthesia, with regular postoperative dressing changes and stitch removal, and benign lesions require pathological examination.