An abdominal mass is an abnormal mass palpated by the clinician on abdominal examination. The common causes are inflammatory mass, tumor mass, obstructive mass, etc.. 1. Inflammatory mass: such as mesenteric lymph node tuberculosis, periappendicitis mass, perirenal abscess. Most of them are accompanied by fever, elevated white blood cell count, local pain and other signs of inflammation. 2. Tumor mass: benign tumors have a long history, large, smooth tumors, and a certain degree of mobility. Most of them are substantial masses, which are easy to produce compression symptoms to the surrounding tissues and organs; malignant tumors account for most of them, characterized by rapid development, accompanied by anemia, lethargy and malignant stasis in the late stage, which is a serious threat to life. 3. Obstructive mass: the mass obstructing the urinary tract often causes lumbar distension and pain. Obstructive masses in the biliary tract cause painless jaundice, usually without fever. Obstructive masses in the gastrointestinal tract can cause abdominal pain, vomiting, bloating, constipation without gas. The main types of masses that cause obstruction are stones and polyps. If there is a solid abdominal mass, you need to consult a doctor as soon as possible, complete the examination, make a clear diagnosis and then follow the doctor’s instructions for treatment to avoid delaying the condition.