Interventional treatment of tumor complications is mainly to treat complications related to tumor lesions or associated with treatment. The aim of treatment is to reduce the symptoms and improve the quality of life of patients. It is mainly the treatment of various lumen such as blood vessels, bile duct, digestive tract, trachea, urethra, etc. due to postoperative or tumor compression caused stenosis. Transcatheter decompression and drainage: Many tumors often cause duct obstruction due to compression of human duct system, such as pancreatic cancer, bile duct cancer, gallbladder cancer, etc., which can compress bile ducts and cause bile stagnation and obstructive jaundice, which can endanger patients’ lives if not treated in time. Using transcatheter decompression drainage, i.e., skin puncture of hepatic bile duct cannula for decompression drainage and placement of drainage tube, jaundice can gradually subside in about 1 month. Pelvic tumor and retroperitoneal tumor can compress ureter and lead to urinary tract obstruction, so cannula decompression can also be used to relieve the obstructive symptoms of urinary tract. For patients who cannot eat due to postoperative esophageal cancer or tumor invasion resulting in esophageal stricture, an esophageal stent can be placed to prop up the strictured segment to solve the patient’s problem. For patients with biliary tract and urinary tract obstruction mentioned above, while decompression and drainage, a stent can be placed to support the stenotic segment and restore the original structural pattern of the duct without surgery, which greatly reduces the patient’s pain and opens up a new way for the treatment of complications caused by many biliary tract, urinary tract and gastrointestinal tumors. Mediastinal tumors (such as thymic cancer, lymphoma, etc.) or enlarged mediastinal lymph nodes caused by tumors can compress the superior vena cava, resulting in obstruction of blood flow back to the heart from the upper limbs and the face, resulting in facial edema, which seriously affects the quality of life of patients. Tracheal tumor or enlarged lymph nodes around trachea will compress trachea and cause difficulty in breathing, which is a dangerous condition. Tumor metastasis to bones, abdominopelvic cavity, chest wall and other parts often cause pain and discomfort. Interventional treatment can control tumor growth and inactivate tumor activity through local freezing or radiofrequency ablation to achieve the purpose of blocking painful stimulation.