Generally speaking, according to the different parts of malignant cysts, clinically different symptoms can be manifested: First, if the malignant cysts are located in the thyroid gland, the larger cysts will be compressed to the trachea, esophagus patients can appear swallowing, breathing difficulties. In severe cases, serious complications such as asphyxia may even occur; second, if the malignant cyst is located in the abdominal cavity and presses on the intestinal tract, it will cause intestinal peristalsis to weaken, and intestinal obstruction will occur. If the malignant cyst in the abdominal cavity compresses the iliac blood vessels, abdominal aorta and other large blood vessels, it will cause severe ischemia and hypoxia in the lower limbs, resulting in serious complications such as decreased skin temperature, pale skin color, and even localized gangrene; Third, malignant cysts are located in the liver, which can cause obvious damage to the liver tissue. Patients with hepatic insufficiency will show symptoms such as yellowing of the skin sclera, pain in the right upper abdomen, nausea and vomiting.