If the stomach is hard and painful when pressed, and if the whole abdomen is hard, it is common in peritonitis caused by acute inflammation, clinically known as platysmal abdomen. If the pain is caused by a localized abdominal mass, it is common in the intra-abdominal tissues or the tissues of the abdominal wall. The formation of abdominal masses due to enlargement, distension, and hyperplasia caused by lesions, such as inflammatory gallbladder effusion, appendiceal abscess or ileal tuberculosis, tuberculosis of the pelvis, or malignant tumors of hepatocellular carcinoma, gallbladder cancer, colon cancer, ovarian cancer, uterine fibroids, and kidney cancer, can also cause masses. The obstructive nature is commonly seen in pyloric obstruction, intestinal obstruction, urinary retention of the bladder, hydronephrosis, and some rare parasitic infections such as hepatic encystasis, intestinal ascariasis, or advanced schistosomiasis. The causes are more varied and complex. Inflammatory masses may be accompanied by hypothermia in addition to pain. If the mass is accompanied by yellowing of the body, it is commonly associated with lesions of the liver, bile and pancreas. If the mass is accompanied by severe gastrointestinal pain or bleeding, it suggests a gastrointestinal lesion. If the mass is combined with vomiting and abdominal cramps suggesting obstructive masses and lesions, it is recommended to go to the hospital for treatment and CT abdominal investigation in a timely manner if it is more serious, and not to insist on no treatment at home.