The document discusses civilization diseases, which are diseases associated with modern lifestyles and behaviors such as overeating, smoking, lack of exercise, stress, and unhealthy diets. It lists several civilization diseases including lung cancer, heart disease, diabetes, and stroke. The main causes outlined are smoking, an unbalanced diet with excess food, lack of exercise, stress, alcohol consumption, and drug use. The document recommends improving nutrition, exercising regularly, avoiding stress and drugs, and visiting doctors regularly to help prevent civilization diseases.