Peritoneal tumors include benign and malignant tumors of varying severity. The two main types of peritoneal tumors include primary peritoneal tumors and metastatic. Primary tumors also include tumors of epithelial origin, tumors of smooth muscle origin and tumors of unknown origin. Tumors of smooth muscle origin are benign lesions, and tumors of unknown origin include mesenchymal small round cell tumors, which are extremely rare and highly malignant soft tissue sarcomas. Metastatic peritoneal tumors are malignant. Due to the progression of the disease, it can cause some clinical signs and symptoms that lead to severe pain in patients, and there will be damage to the liver, kidneys, heart and other important organs, which can eventually lead to the death of patients. The treatment of peritoneal malignant tumors usually uses radiotherapy, chemotherapy, molecular targeting, and surgical resection. If peritoneal tumors are suspected, you need to seek medical attention as soon as possible to receive clinical professional treatment to avoid delay.