The symptoms of malignant tumors may vary depending on the organ and site where they are located and the degree of development, but most malignant tumors have no obvious symptoms in the early stage, and even if they have symptoms, they are often not characteristic. Generally speaking, we divide the clinical manifestations of cancer into two aspects: local manifestations and systemic symptoms. 1.Lumps Cancer of thyroid, parotid gland or breast can be touched in the more superficial parts under the skin. Tumor metastasis to lymph nodes can lead to enlarged lymph nodes. Certain superficial lymph nodes, such as cervical lymph nodes and axillary lymph nodes, are easily palpable. Some superficial lymph nodes, such as cervical lymph nodes and axillary lymph nodes, can be easily touched. As for stomach cancer and pancreatic cancer in deeper parts of the body, they can only be touched by pressing hard. Malignant tumors including cancerous masses grow rapidly and the surface is not smooth and not easy to push; benign tumors generally have smooth surface and slide easily like eggs and ping pong balls. 2.Pain The swelling growth or breakage of tumor, infection, etc. stimulate or compress the peripheral nerve or nerve trunk, which may cause local pain. The appearance of pain often indicates that the cancer has entered the middle or late stage. At first, it is mostly a vague or dull pain, which is obvious at night. Later on, the pain will gradually increase and become unbearable, day and night, especially at night. The effect of general painkillers is poor. 3.Ulcer Tumor on body surface or gastrointestinal tract, if it grows too fast, it may cause tissue necrosis or ulceration due to secondary infection. 4.Hemorrhage is caused by the invasion of blood vessels or the rupture of small blood vessels of cancerous tissues. For example, lung cancer patients may hemoptysis or blood in sputum; stomach, esophagus and colon cancer may vomit blood or blood in stool; urinary tract tumor may appear hematuria; cervical cancer may have vaginal bleeding; liver cancer rupture may cause intra-abdominal bleeding. 5.Obstruction The rapid growth of cancer tissues can cause obstruction of cavity organs. Esophageal cancer can obstruct the esophagus and cause difficulty in swallowing; biliary tract cancer can obstruct the common bile duct and cause jaundice; bladder cancer can obstruct the urethra and cause difficulty in urination; stomach cancer with pyloric obstruction can cause epigastric fullness and vomiting after meals. 6. Systemic symptoms Early malignant tumors mostly have no obvious systemic symptoms. The common non-specific systemic symptoms of malignant tumor include weight loss, loss of appetite, cachexia, profuse sweating (night sweating), anemia, weakness, etc. 7.Other intracranial tumors can cause visual impairment (compression of optic nerve), facial palsy (compression of facial nerve) and other neurological symptoms; bone tumors invading bones can lead to fracture; liver cancer can cause plasma albumin decrease and result in ascites, etc. Tumor metastasis can cause corresponding symptoms, such as regional lymph node enlargement and cancerous pleural fluid caused by lung cancer pleural metastasis.