Cancers are closely related to three factors, genetic factors accounted for 10% to 15%, medical conditions, factors that accounted for 5% ~ 10%. Associated with cancer the most important factor is the individual lifestyles, about 80%, such as smoking, alcohol, high fat diet, salt intake too much, bad personal hygiene, unhealthy sexual behavior, etc. are linked to cancer pathogenesis.
Cancer personality, is easily lead to cancer of the personal character traits. Character and human cancer, close, according to the statistics show that cancer patients generally have certain personality characteristics of people with these personality character than other people, prone to cancer, so called "cancer personality" .

According to statistics, and others more distant and easy, unassuming people, compared with the ordinary people are more susceptible to the digestive system and lymphatic system cancers; character of depression, feelings of people who are not exposed to risk of cancer than a cheerful disposition who want to 15 times higher. Because of mental depression (depression is not just "heart disease"), long-term effects of such negative emotions in the central nervous system, resulting in autonomic nervous function and endocrine function of the disorder, so that the body's immune functions were suppressed in cancer cells break through the immune system's defense form of cancer.