Any kind of disease will always show certain signals on the eve of its onset. If we understand these signals, we can grasp the pattern and characteristics of the disease, and it is possible to detect and treat the disease at an early stage, thus improving the cure rate. What are the common signals of cancer? (1) Choking sensation when swallowing food, pain, tightness and discomfort behind the sternum, foreign body sensation in the esophagus or pain in the upper abdomen are the first signals of esophageal cancer. (2) Upper abdominal pain: people used to call it heartburn. If you are usually well, but gradually find discomfort or pain in stomach (equivalent to epigastric region), and can not be relieved by pain-relieving and acid-relieving medicines, and continue to have bad digestion, you should be alert to the occurrence of gastric cancer at this time. (3) Irritating cough with prolonged cough or bloody sputum: Lung cancer mostly grows in the wall of bronchial tubes. Due to the growth of cancer cells, it destroys the normal tissue structure and strongly stimulates the bronchial tubes, causing cough. It cannot be relieved well by antibiotics and cough suppressants, and gradually worsens with occasional bloody sputum and chest pain. This kind of cough is often regarded as an early signal of lung cancer. (4) Breast lumps: often female breasts are soft. If the lump is touched and the age is over 40, women should consider the possibility of breast cancer. (5) Abnormal vaginal bleeding: Normal women menstruate once a month and usually do not experience vaginal bleeding. If bleeding occurs after sexual intercourse, it may be a sign of cervical cancer. The amount of post-coital bleeding is usually small, if attention can be drawn to it, early cervical cancer may be detected. (6) Nasal discharge with blood: Nasal discharge with blood is mainly manifested as a small amount of blood in nasal discharge, especially in the morning, which is often an important signal of nasopharyngeal cancer. Nasopharyngeal cancer, except for nasal discharge with blood, is often accompanied by nasal congestion, which is due to the compression of nasopharyngeal cancer mass. This is due to the compression of nasopharyngeal cancer mass. If the cancer presses the Eustachian tube, tinnitus will also appear, so bloody nasal discharge, nasal congestion, tinnitus, headache, especially one-sided migraine, are all dangerous signals of nasopharyngeal cancer. (7) Abdominal pain, falling and blood in stool: If people over 30 years old have abdominal discomfort, hidden pain, abdominal distension, change of bowel habit, feeling of falling and blood in stool, followed by anemia, fatigue, and feeling lump in abdomen, they should consider the possibility of colorectal cancer. The limited and intermittent pain along the intestines is the first alarm signal of colorectal cancer. Obvious falling sensation with blood in stool is often a signal of rectal cancer. (8) Right subcostal pain: right subcostal pain is often referred to as pain in the liver area, which is common in hepatitis, cholecystitis, cirrhosis of liver and liver cancer. Hepatocellular carcinoma starts insidiously and develops rapidly, and some patients are diagnosed with hepatocellular carcinoma only after the pain under right rib lasts for several months. Therefore, right subcostal pain should be regarded as a signal of liver cancer. (9) Headache and vomiting: Headache occurs in the morning or at night, and is often obvious in the forehead, occiput and both sides. Vomiting has nothing to do with eating, and often occurs with the aggravation of headache. Headache and vomiting are common clinical symptoms of brain tumor, and should be regarded as danger signals of intracranial tumor, CT examination can help to confirm the diagnosis. (10) Long-term unexplained fever: cancers of hematopoietic system, such as malignant lymphoma and leukemia, often have fever. The clinical manifestation of malignant lymphoma is painless progressive lymph node enlargement, and along with the lymph node enlargement, the patient may have fever, emaciation, anemia and other symptoms. Therefore, long-term unexplained fever should be suspected as a signal of hematopoietic malignant tumor. When all the above suspicious signals appear, you should neither be rash nor take it lightly. You should go to the hospital in time for consultation and necessary examination so as to avoid delaying the condition and causing lifelong regret.