The right lower side of the stomach pain groin also a little bulge to consider may be inguinal hernia, the most common inguinal hernia is a straight hernia and hiatal hernia. Inguinal hernia is a type of extra-abdominal hernia. The abdominal cavity organs or tissues together with the peritoneal wall layer constitute the hernia sac, extra-abdominal hernia refers to the hernia sac through the abdominal wall weak points, holes, etc., to the body surface of the disease protruding. Common causes include reduced strength of the abdominal wall (e.g., dysplasia, prolonged illness, poor incision healing, etc.) and increased intra-abdominal pressure (e.g., prolonged constipation, coughing, pregnancy, ascites, etc.). 1. Direct hernia: refers to the hernia sac protruding directly from back to front, passing through the weak area of the lower abdominal wall artery medial to the direct hernia triangle. The main manifestation is that when the patient is upright, half of the spherical mass protrudes from the medial end of the inguinal canal, the pubic tubercle on the outer side, not accompanied by pain or other symptoms. Generally lying down after the hernia block can disappear on its own, do not need to push the hand to reset. 2. Hiatal hernia: the most common inguinal hernia, the hernia sac through the abdominal wall artery lateral to the deep ring of the inguinal canal penetrated to the shallow ring, was inward, downward, forward diagonal walking behavior, can enter the scrotum. The main manifestation is a protruding mass in the inguinal area, which can sometimes be distended and painful, and when incarceration occurs, the pain is obvious. If left untreated, inguinal hernia can aggravate the damage to the abdominal wall, affecting daily life, especially hiatal hernia, incarcerated or strangulation can be life-threatening, so it should be timely to the regular hospital, usually need early surgical treatment.