The chart above shows the top 10 causes of death in the United States in 2005. The situation is similar in China. With the control of malignant infectious diseases, cancer, cardiovascular and cerebrovascular diseases gradually become the top three causes of death. In Europe and the United States, due to preventive health measures implemented in recent years, the death and disability rates of cardiovascular and cerebrovascular diseases have gradually decreased. However, the incidence of cancer is still high. Therefore, it is still a long way to go to prevent the occurrence and development of cancer. The formation of tumor needs a process, and most tumor patients will show certain symptoms in the early stage. The following are some common symptoms of cancer for reference only: 1. Lumps: palpable lumps on any part of the body such as skin, neck, breast, abdomen, bones, etc., generally large or small, single or multiple, skin color as usual, no pain, no itch. 2. 2.Sudden change of moles and warts: The moles or warts suddenly increase in size, deepen in color, ooze, ulcerate, desquamate, bleed or become rough, etc. 3, ulcers do not heal: ulcers that occur on mucous membranes and skin do not heal for a longer period of time. 4.Choking cough and bloody sputum: Unexplained cough and blood in sputum, which does not improve after treatment or sometimes offends, and may be accompanied by slight chest pain. 5.Insensibility of eating: there is a feeling of foreign body or obstruction in the esophagus when swallowing, especially when the first swallow is obvious, or the pain is dull behind the sternum. This symptom has the tendency of getting worse day by day. 6, loss of appetite, epigastric discomfort: epigastric distention after eating, or irregular pain. 7, blood in the stool: no obvious reason for blood in the stool, black stool, accompanied by stool changes, constipation and thin stool alternately. 8.Painless hematuria and dyspareunia. 9.Nasal congestion, nasal secretion with blood. 10.Increased leucorrhea and abnormal bleeding: middle-aged women, especially before and after menopause, suddenly have increased leucorrhea or irregular vaginal bleeding. 11.Long-term low fever: unexplained long-term fever, excluding infectious diseases and hyperthyroidism, etc. and ineffective treatment. 12, fatigue, wasting: unexplained physical weakness, fatigue and significant weight loss in a short period of time. Exclude hyperthyroidism, etc. 13, hoarseness: excluding pharyngitis, should be taken seriously. 14, repeated (facial) skin folliculitis infection, pustules, suggesting a decrease in the immunity of the body. 15, repeated colds but no fever. It indicates that the body’s resistance and immunity are declining. 16.Stubborn erratic reflux (commonly known as hiccups): suggests that the diaphragm is irritated. 17, pain (such as headache, chest pain, abdominal pain, limb pain, etc.), nausea, etc. The above symptoms may be the early manifestation of certain malignant tumors and should be promptly examined in the hospital.