In simple terms, mucinous adenocarcinoma is a type of cancer that secretes more mucus, usually occurs in the gastrointestinal tract and breast, and has a higher mortality rate and higher risk of spreading. Mucinous adenocarcinoma is a malignant tumor of epithelial tissue line epithelium, which has the possibility of infection for respiratory tract and digestive tract, and once the line cavity expands, it will eject a large number of mucinous cancer cells so it is more likely to spread, and it occurs mostly in the gastrointestinal tract. For early malignant tumors, the chance of mucinous adenocarcinoma is relatively small, and the cancer cells are in the primary proliferation stage, but the symptoms of early cancer in general are not obvious. Once mucinous adenocarcinoma is detected, it has often spread and is in the middle and late stages of the disease, with pain and ascites. The disease can be controlled by surgery, chemotherapy, radiation therapy and targeted drug therapy, especially a certain degree of chemotherapy is required to master the load of resected tumor in order to stop the spread of mucus. For patients with advanced stage, they have to undergo conservative treatment, and can be treated with Chinese herbal medicine to control the mass, reduce pain and prolong survival. If the immunity is strong and the anti-cancer is effective, clinical cure can be achieved. If surgery can be done, it is recommended to take anti-cancer drugs after surgery to speed up recovery and tissue repair. In conclusion, mucinous adenocarcinoma is a relatively common type of cancer, and as for the difficulty, it is relatively large. In recent years, radiotherapy and chemotherapy have progressed faster, so there are many treatment methods that can be used, such as the use of light red examination and treatment must line excision.