Many times, things do not come without a reason. For example, some not-so-good behavioral habits in daily life may let cancer germinate quietly. Lazy to go out to the sun is prone to many kinds of cancers According to Harvard Medical School O’Van Nuz, sun exposure can prevent cancer, and the skin only produces vitamin D after receiving ultraviolet radiation, which can eliminate the blood environment for tumor formation and prevent colon cancer and prostate cancer. Infants and children should get 15-30 minutes of sunlight a day, older people should get 40-60 minutes of sunlight a day, and other people should try to go out more often to receive sunlight. Lazy shaving is prone to respiratory cancer Many harmful gases that are discharged when the human body breathes can be retained in the beard, plus the atmosphere contains a variety of heavy metal particles, automobile exhaust emissions of polycyclic aromatic hydrocarbons, lead, etc. will also be adsorbed by the beard, these harmful substances may enter the respiratory tract. Russian researchers found that the beard contains a variety of harmful substances, such as benzene, toluene, hydrogen sulfide, acetone, ammonia and so on. In addition, dust and microorganisms in the air, carcinogens contained in smoke and lead in car exhaust are also easily adsorbed on the beard. If you can’t shave regularly, these harmful substances will easily infringe on the respiratory tract and increase the risk of cancer. Lazy people often send their clothes to dry cleaners, however, dry cleaning will use a chemical called tetrachloroethylene as the active solvent, which is harmful to the human nervous system and may cause kidney cancer if exposed to this toxic substance for a long time. When dry-cleaning clothes, this chemical will be absorbed by the fibers to the clothes, and will be released from the clothes when the air is dry, but dry-cleaning clothes are often placed in unventilated huts, resulting in tetrachloroethylene can not be fully volatilized, if eager to wear on the body, easy to absorb toxic chemicals into the body, it is best to hang the dry-cleaned clothes in the ventilation to dry 1 week before wearing. Lazy to sleep with lights off is easy to help cancer cells grow Children who are used to sleeping with lights on are more likely to suffer from cancer, because the incidence of childhood leukemia is related to exposure to lights at night. Some studies have shown that infants aged 4 to 5 months are susceptible to unnatural light, which can disrupt the physiological rhythm and inhibit melatonin secretion, and reduced melatonin is associated with cancer cell growth. Many people have the urge to urinate, but they don’t want to put down the work at hand and go to the toilet only when they can’t hold it anymore. Research shows that this will damage the sphincter of the bladder first. Urine containing toxic substances cannot be discharged in time, which can cause cystitis and urethritis, and upward infection of inflammation can also induce nephritis. Researchers have found that people who have the habit of holding urine have 3 to 5 times more risk of bladder cancer. Lazy brushing increases the risk of cancer Rinsing once can reduce oral bacteria by 20%, and brushing once can reduce them by about 70%. Lazy brushing not only leads to ulcers, bleeding gums and periodontal disease, but also increases the risk of colds and aspiration pneumonia in the elderly. A study by the Japanese Cancer Research Center found that lazy brushing is 2.5 times more likely to cause cancer than people who brush twice a day. Brushing can reduce the risk of cancer by getting rid of streptococcus bacteria left in the mouth in time. It is best to brush twice a day in the morning and in the evening.