There is no country in the world that can openly fight against cancer. When it comes to cancer, we are all disheartened because 79% of the cases are found in the late stage, so it is very important to prevent cancer! The 5-word “Cancer Prevention Signal”: pain, block, blood, decrease and burn. 1. Pain 1. Chest pain: burning sensation behind the sternum, pain, and obstruction of swallowing, suggesting the possibility of stomach cancer, pancreatic cancer or esophageal cancer. 2. Neck pain: neck pain, facial edema, hardness, constriction and oppression, suggesting that the tumor may compress the superior vena cava, resulting in obstruction of blood return. Headache: headache, and it is getting more and more painful, and at the same time, there is difficulty in seeing things, nausea and vomiting, which may be the symptom of brain tumor or brain metastasis caused by lung cancer. Second, lumps 1. Lumps in the superficial part of the body that get bigger quickly in a short time or never go away; cancerous lumps are usually lumps without rules, itching, oozing and ulceration. 2.Thyroid swelling, sudden hoarseness or sudden inability to produce voice, not only the thyroid condition should be checked, but also whether there is a tumor , to prevent laryngeal cancer and thyroid cancer from being under-diagnosed. 3, breast asymmetry on both sides, irregular lumps, orange peel-like changes, perhaps breast cancer. Third, blood exclude women’s normal menstrual bleeding, no matter which organ bleeding for no reason, but also a long time, may be the early warning signals of cancer. 1.Blood in sputum, coughing up blood: besides the temporary bleeding caused by too much exertion or dry sky, it is suggested to pay attention to the harbinger of lung cancer. 2.Nosebleed for no reason: experts say, besides one-time nosebleed triggered by high blood pressure, dry weather, external force, trauma, etc., it may be blood disease or nasopharyngeal cancer. 3, postmenopausal vaginal bleeding: women have blood in vagina after menopause, suggesting to pay attention to the signals of cervical cancer. Bleeding from nipple: bloody discharge from woman’s nipple may be breast duct tumor or breast cancer. 5. Blood in stool: blood in stool and change of bowel habit and urgency, suggesting that attention should be paid to the early signs of colorectal cancer. Blood in urine: hematuria, especially painless hematuria, suggests the need to pay attention to the signals of kidney cancer and bladder cancer. Loss: Sudden weight loss in a short period of time, and the more you lose, the less you lose (except for diabetes and hyperthyroidism), suggesting that attention should be paid to the possibility of tumor. Persistent fever, especially low fever, adults need to pay attention to the possibility of kidney cancer, liver cancer and other tumors. Children need to pay attention to the possibility of blood system tumor.