For malignant tumors, early and correct diagnosis is the key to proper treatment and successful treatment. Most of the malignant tumors that occur in human body occur and grow on the surface of the body or in areas that can be easily detected by examination. For example, skin cancer occurs in the skin; lip cancer, tongue cancer, cheek mucosa cancer, tonsil cancer, nasopharyngeal cancer, laryngeal cancer, parotid cancer and thyroid cancer in the oral cavity; breast cancer in the breast; penile cancer and cervical cancer in the genitourinary system; malignant lymphoma in the superficial lymph nodes; and anal canal cancer and rectal cancer. Only by learning the knowledge of self-examination, it is easy to early malignant tumors DD stomach cancer, lung cancer and brain tumor that occur in the body cavity. With the modern medical equipment conditions constantly updated, cancer examination and diagnosis are becoming easier and easier. Therefore, it is extremely important for middle and old people to have regular medical checkups; and cancer prevention medical checkups should be taken as one of the main elements of health care checkups. Carrying out tumor screening combined with prevention and treatment is the best way to detect malignant tumors at an early stage, especially for areas with high tumor incidence. As long as we pay attention to the early symptoms and signs of cancer and conduct timely examination or regular screening, most cancers can be detected at an early stage. Any kind of disease always shows certain signals on the eve of its onset. If we understand these signals, we can grasp the rules and characteristics of disease occurrence, and then it is possible to detect and treat early, thus increasing the cure rate. What are the common signs of cancer? (1) Choking sensation when swallowing food, pain, stuffiness and discomfort behind the sternum, foreign body sensation in the esophagus or pain in the upper abdomen are the first signs of esophageal cancer. (2) Upper abdominal pain People used to call it heartache. Usually, it is always good, but when you gradually find discomfort or pain in the stomach (equivalent to upper abdomen), which cannot be relieved by taking pain-relieving and acid-relieving drugs, and persistently have poor digestion, you should be alert to the occurrence of stomach cancer at this time. (3) Irritating cough with prolonged cough or bloody sputum Lung cancer mostly grows in the bronchial wall, and the growth of cancer cells destroys the normal tissue structure and strongly stimulates the bronchial tubes, causing cough. It is not well relieved by antibiotics and cough suppressants, and gradually worsens, occasionally with bloody sputum and chest pain. This kind of cough is often considered as an early sign of lung cancer. (4) Breast lumps Normal female breast is soft in texture. If a lump is touched and the woman is over 40 years old, breast cancer should be considered as a possibility. (5) Abnormal vaginal bleeding Normal women have menstruation once a month and usually do not have vaginal bleeding. If bleeding occurs after sexual intercourse, it may be a sign of cervical cancer. The amount of bleeding after sexual intercourse is usually small, but if attention can be drawn to it, early cervical cancer may be detected. (6) Blood in the nose Blood in the nose is mainly manifested as a small amount of blood in the nose, especially blood in the nose in the morning, which is often an important signal of nasopharyngeal cancer. Therefore, blood in the nose, nasal congestion, tinnitus and headache, especially one-sided migraine, are all danger signs of nasopharyngeal cancer. (7) Abdominal pain, cramping and blood in stool Anyone over 30 years old who has abdominal discomfort, hidden pain, bloating, change in stool habit, cramping and blood in stool, followed by anemia, weakness and lump in abdomen should consider the possibility of colorectal cancer. The first alarm signal of colorectal cancer is limited and intermittent hidden pain along the intestinal area. The obvious feeling of falling with blood in stool is often a signal of rectal cancer. (8) Right subcostal pain Right subcostal pain is often called liver pain, which is commonly associated with hepatitis, cholecystitis, liver cirrhosis and liver cancer. Liver cancer starts insidiously and develops rapidly, and some patients are diagnosed with liver cancer only after their right subcostal pain lasts for several months. Therefore, right subcostal pain should be regarded as a sign of liver cancer. (9) Headache and vomiting Headache occurs mostly in the morning or evening, and is often obvious in the forehead, posterior occipital area and both sides. Vomiting has nothing to do with eating and often occurs with the increase of headache. Headache and vomiting are common clinical symptoms of brain tumor and should be considered as danger signs of intracranial tumor. (10) Long-term unexplained fever Cancers of the hematopoietic system, such as malignant lymphoma and leukemia, often have fever. Malignant lymphoma clinically manifests as painless progressive lymph node enlargement. Along with lymph node enlargement, patients may develop fever, emaciation, anemia and other symptoms. Therefore, prolonged fever of unknown origin should be suspected as a sign of malignant tumor of hematopoietic system. When all these suspicious signs appear, you should not take them lightly. You should go to the hospital and undergo the necessary examinations in time to avoid delaying the disease and causing lifelong regrets.