It is now known that most cancers are caused by unhealthy lifestyles. As long as we change our lifestyle, quit smoking and limit alcohol, maintain a good state of mind, pay attention to physical exercise, do not overwork our body, take the initiative to relieve mental stress and do health check-ups frequently, the probability of cancer can be greatly reduced. For the sake of convenience, we may talk about several aspects from clothing, food, housing and transportation: clothing: underwear is best to wear cotton fabrics. Do not wear bright, dark-colored chemical fiber clothes close to the body. Newly purchased clothes, especially underwear, it is best to wash a water before wearing. Women must take off their bras to sleep. Use non-toxic, low-toxic hair dyes when dyeing hair, and reduce the number of times you dye your hair to a maximum of twice a year. Women do not use cosmetics that contain hormones. Dry-cleaned clothes in the dry-cleaning store should be fully ventilated and dried before wearing. Store clothing do not use naphthalene pills to prevent moths, it is best to use natural mothballs. Use softener and other detergents to wash after a full rinse. Families with small children, underwear should wear light-colored cotton fabrics. Food: First of all, we should quit smoking and limit alcohol, especially for people with chronic lung diseases. People with no liver problems can drink red wine in moderation. To eat more fresh vegetables and fruits, eat more vegetables and fruits to maintain the body’s weak alkaline internal environment. Soak them in warm water or soak them in non-toxic cleaning agents before consumption, and peel them if necessary. Eat more vegetables and fruits with anti-cancer effects (such as yellow and green), and eat sweet potatoes, mushrooms, fungus, etc. regularly. Eat more white meat (fish, chicken and rabbit meat) and less red meat. Families with conditions can use water purifiers. Increase the intake of coarse grains, coarse fiber food and soy products. Drink more green tea, fresh milk or yogurt. Eat less high-calorie foods such as McDonald’s and KFC. Promote food diversification, simplicity and less use of food additives. Dinner should be as light as possible, and eat less high-calorie, fatty, sweet and thick things. Do not eat barbecue `some food, eat less fried food. Eat slowly and chew, not too fast, too hot. Do not eat expired, spoiled, moldy food. Live: Do not over-decorate your room, do not use building decoration materials that can cause indoor air pollution. The kitchen should be properly installed with high efficiency hoods and exhaust fans, and turn off the fire to open the hood for five minutes more. No matter winter or summer, indoor windows should be frequently opened for ventilation, without the so-called air freshener. You can use the air conditioning unit with ventilation function. Use air humidifier in autumn and winter to maintain a certain humidity in the air. Do not plant poisonous flowers in the bedroom, keep birds and other hairy pets. Do not sleep with the lights on. To maintain a regular life, do not intentionally interfere with the biological clock. Ensure enough sleep, do not stay up late playing mahjong, Internet, playing amusement machines, etc. Line: excessive exposure to ultraviolet light can increase the occurrence of malignant melanoma, so prevent direct sunlight exposure in summer. After 10:00 a.m. and before 4:00 p.m., outdoor workers should intentionally avoid direct sunlight at noon. When you have to go out, wear long-sleeved shirts, put on some sunscreen, and play UV protection umbrellas. Bicyclists should try to drive on the side of the road to reduce the inhalation of car exhaust. Avoid serious road pollution sections and periods, and wear a medical mask in winter mornings when air convection is poor. Private car family to avoid excessive decoration inside the car, before driving to ventilate the car. Newly purchased vehicles should be placed in the car adsorbents such as bamboo charcoal to adsorb formaldehyde xylene and other harmful gases. In addition, the body has abnormalities in a timely manner to the hospital for examination. Smokers regularly do lung x-ray, (but to reduce the number of CT), chronic gastric ulcer, atrophic gastritis, ulcerative colitis, multiple polyps to do regular gastroscopy, colonoscopy. Those with chronic hepatitis should have regular liver ultrasound examinations, and married women should have breast palpation or mammography, cervical TCT and abdominal ultrasound examinations at least once a year. Those who have epistaxis, blood in sputum, nipple overflow, blood in urine, blood in stool, and vaginal bleeding outside the menstrual period of women should visit the hospital at any time for examination. Chronic ulcers on the body surface, rapidly growing lumps or accelerated growth of existing lumps in the short term, sudden weight loss in the elderly, changes in the nature of existing pain in chronic diseases, darkening and enlargement of moles on the body surface within a short period of time, lumps on the neck, especially on the collarbone, and unexplained lumps on the female breast (or with nipple inversion or lifting, breast skin depression, orange peel sign, etc.) should be examined in detail at the hospital in a timely manner. Most cancers can be detected at an early stage as long as we spend a little time and money to have a health checkup in hospital every year.