I. Esophageal cancer: there is a sluggish, stagnant or slight obstructive choking sensation when swallowing food, which can subside on its own but can appear again after several days, recurring and gradually worsening. Or when swallowing saliva or eating, it always feels like there is localized pain in the sternum. Usually, it feels like there is a foreign body in the esophagus and it is not related to eating, and it persists, and drinking water and swallowing food cannot make it disappear. Gastric cancer: suddenly appear unexplained indigestion symptoms, which are more stubborn and fast progressing; the prominent manifestations are rapid decrease of appetite, abdominal fullness and discomfort after eating, and at the same time, significant weight loss. Or, people who did not have stomach pain (“heartburn”) in the past suddenly have recurrent stomach pain; although they had stomach pain in the past, the intensity, nature, and duration of pain attacks have suddenly changed recently, and drugs that were effective in treatment have become ineffective or poor. Colorectal cancer: Anyone over 30 years old who has abdominal discomfort, hidden pain, bloating, change in stool habit, constipation, diarrhea or alternately, feeling of falling, and ambassador with blood, followed by anemia, fatigue and weakness, and lumps felt in the abdomen, should consider the possibility of colorectal cancer. Among them, limited and intermittent hidden pain along the colon area is the first alarm signal of colon cancer. The obvious feeling of falling with blood in stool is the signal of rectal cancer (colon cancer includes colon cancer and rectal cancer). Liver cancer: early liver cancer has no specific symptoms, and if there are some complex manifestations of pre-cancerous diseases. However, patients with chronic hepatitis or cirrhosis should be highly alert if they have stabbing pain or increased pain in the right upper abdomen or liver area, physical discomfort, loss of appetite, progressive indigestion, accompanied by persistent diarrhea and significant weight loss. V. Nasopharyngeal cancer: A common feature of early signs of nasopharyngeal cancer is that the symptoms (and signs) mostly occur unilaterally. Unilateral snot and blood (meaning blowing out), unilateral nosebleed, unilateral tinnitus, unilateral hearing loss, unilateral headache, and unilateral cervical lymph node enlargement. VI. Brain tumor: The main manifestations are headache and vomiting. The headache is very special, often the heaviest when waking up in the early morning, and can be gradually reduced after waking up, which is obvious in the forehead, posterior occipital area and both sides. The headache is often accompanied by vomiting, which is not related to eating, especially when the pain is severe, and the headache will be relieved after vomiting. 7. Lung cancer: cough is an early symptom of lung cancer, characterized by paroxysmal irritating choking cough, with the feeling of coughing up, generally no sputum or only a small amount of white foamy sputum, and pus sputum may appear secondary to infection. If there is no improvement after 2 weeks of anti-inflammatory treatment, the possibility of lung cancer should be alerted. Or if the nature of cough changes on top of the existing chronic cough, even accompanied by “bronchial tinnitus” and “shortness of breath”, it should be noted. Another warning sign of lung cancer is intermittent recurrent small amount of bloody sputum or sputum with blood in it. In addition, symptoms such as chest and back pain, chest tightness and fever may also appear. Breast cancer: abnormal changes in the breast, such as thickening or lump, swelling, slight concavity (“dimple sign”), thickening and redness of the skin, nipple deformation, retraction or scaling, pain or pressure, and sudden unilateral nipple flow (milk-like, blood-like, water-like liquid) in non-lactating women. 9.Cervical cancer: The early symptoms of cervical cancer mainly include the following Vaginal spotting bleeding after sexual intercourse, defecation or activity, blood mixed with vaginal discharge. It appears in small amount at first and often stops on its own. Irregular vaginal bleeding, especially sudden vaginal bleeding after many years of menopause. Increased leukorrhea, bloody or flesh-washing. Pain in the lower abdomen and lower back. Any one of the above should be checked promptly. The focus is on irregular vaginal bleeding, contact bleeding and excessive leucorrhea. X. Leukemia: Fever, bleeding and anemia are the three major early symptoms of (acute) leukemia. A fever of 37.5°C-38.5°C often suggests an infection, such as inflammation of the skin, respiratory tract, intestines, oral cavity, urinary system, etc. Bleeding can occur at any site, but is common in the subcutaneous, oral, nasal, and gingival areas. The degree of bleeding can range from petechiae and petechiae to hemorrhage from the mouth and nasal cavity. Anemia is due to impaired hematopoiesis and bleeding in the red system and evolves rapidly, and the patient is pale. In addition, swollen lymph nodes and bone and joint pain may be present, characterized by light pressure pain in the sternum.