The early manifestations of cancer are not specific, that is to say, if you have these manifestations, you should think of the possibility of cancer, but it is not necessarily cancer, you should not take the right number and scare yourself. Cancer prevention is “prevention before it happens”, which is the primary prevention; cancer screening is the secondary prevention, which is for asymptomatic people, that is, for people who do not have any physical discomfort, and usually for people who are at high risk of cancer, so that some precancerous lesions and early cancers can be detected early. 15 earlier manifestations or signs of cancer: these earlier manifestations of cancer are not specific, that is to say, if you have these manifestations, you should think of the possibility of cancer, but it is not necessarily cancer, you should not be right, you should not scare yourself, cancer may have one or several of these manifestations, but some manifestations are not equal to cancer, you should understand correctly, it just reminds you to pay high attention and you must go to hospital for further examination to clarify the diagnosis. In addition, the appearance of these manifestations may also mean that the cancer has developed to a more advanced stage, but no matter what, if you have uncomfortable manifestations or these signs, but you still don’t pay attention to them and are still holding a fluke mentality to delay them again and again, you may regret too much by then. 1.Lumps, nodules, hard nodes or hard changes appearing in any part of the body, etc. This is one of the common manifestations of cancer. Special attention and attention should be paid to the lumps appearing on any part of the body, especially those lumps, nodules, hard nodes or hard changes that are gradually increasing in size. Remember that the presence or absence of pain should not be used as the basis for seeing a doctor. 2. Persistent pain of unknown origin. Many diseases may cause pain and discomfort, including the most common cold may also have a headache or generalized aches and pains, many people’s first reaction to pain is to put on pain cream or take painkillers, which will cover up the condition, no matter what discomfort appears, the first thing to do is not to rush to treat, but first to think about what could be the cause. For unexplained pain in any part of the body that is not caused by trauma and lasts for more than a week, you should go to the hospital to find out the cause, because pain may be an early sign of cancer and should not be taken lightly. 3. Cough that is not cured for a long time. Coughing is a very common symptom because most colds are accompanied by coughing, and because of this, coughing usually does not attract much attention. Of course, in most cases it is not a big deal, but for a dry cough or blood in the sputum that is not cured for a long time, especially if you have a long history of smoking, you should suspect the possibility of lung cancer or throat cancer. Some people stop pain in case of pain and cough in case of cough, in fact, the most crucial thing is to find out the cause. 4.Unexplained fever: Many diseases may be accompanied by fever, but if the cause of fever is unknown, especially that kind of persistent low fever, think about the possibility of cancer and make sure to find out the cause, not just use antipyretic drugs. 5.Inexplicable weight loss or fatigue. If there is no exercise to reduce weight, and there is no intentional reduction of diet, but there is unexplained weight loss, or even progressive weight loss and emaciation, or there is indigestion, anemia, weakness, and easy fatigue, etc., the cause must be identified, because it is likely to be one of the manifestations of cancer. However, it is important to distinguish cancer fatigue from general fatigue. General fatigue mostly disappears after rest, while cancer fatigue seems to be unimproved no matter how much rest you take, and will continue to exist all the time, which usually indicates that the cancer is relatively advanced. 6. Non-traumatic abnormal bleeding. Regular blood in stool and black stool should alert to gastrointestinal cancer; irregular vaginal bleeding or discharge, abnormal or heavy menstrual bleeding, or non-menstrual bleeding should alert to gynecological tumor; painless hematuria or with difficulty in urination should alert to bladder cancer or kidney cancer; unexplained easy bleeding should alert to the possibility of leukemia; nasal congestion, epistaxis, especially unilateral nasal bleeding should alert to the presence of nasopharyngeal cancer. 7. Persistent abnormal digestion. Indigestion without appetite is an extremely common manifestation, sometimes transient, sometimes short-lived, sometimes just functional, so people generally do not pay attention to it, but if indigestion without appetite persists, we should go to the doctor as soon as possible to identify the cause. 8, progressive swallowing food obstruction feeling. If there is a feeling of stuffiness behind the sternum or a burning sensation behind the sternum when eating, or a feeling of foreign body in the esophagus, especially a feeling of obstruction when swallowing food that is progressively aggravated, you should suspect whether there is esophageal cancer. 9.Persistent hoarseness. Sometimes there may be temporary hoarseness after talking too much, but for hoarseness that lasts longer and is difficult to recover, it is necessary to be alert to laryngeal cancer, thyroid cancer, lung cancer and esophageal cancer, etc. 10. Change in stool habit. If there is a change in the number of stool habits or the nature of stool, such as thin stool, stool with pus, blood, mucus, etc., or alternating constipation and diarrhea, be alert to colorectal cancer. Black stool or tar-like stool may reflect bleeding in the upper gastrointestinal tract, and one should be alert to the possibility of gastric cancer or gastric ulcer. 11.White spots in the mouth or vulva. If white spots appear on oral mucosa, female vulva or male penis glans, especially if the white spots are rapidly expanding and accompanied by burning and itching sensation, attention should be paid to exclude cancerous changes, especially for long-term smokers. 12. Suddenly enlarged and discolored moles or warts. If a mole on any part of the body suddenly increases in size, changes color or breaks down and bleeds, or if there is burning and itching pain and the original hair falls out, think about the possibility of malignant melanoma. 13. Fracture without trauma. Spontaneous fracture without obvious external force or fracture with slight external force may be pathological fracture and should be alert to skeletal malignant tumor (primary bone cancer or bone metastasis). Adolescents with non-traumatic pain and swelling at the elbow or knee should be careful of leukemia and identify the cause as soon as possible. 14. Persistent wounds or mucosal ulcers. For persistent unhealed wounds or ulcers, consider the possibility of skin cancer. Chronic oral ulcers that do not heal continuously should be alerted to the possibility of oral cancer. Chronic gastric ulcers and atrophic gastritis may become cancerous, so pay attention to regular checkups in hospitals. 15.Growing male breast enlargement. Men with abnormal breast enlargement should be alerted to the possibility of male breast cancer.