1, environmental factors: natural environmental risk factors include biological risk factors, such as bacteria, fungi, viruses and parasites. Physical risk factors, such as noise, vibration and ionizing radiation. ; Chemical risk factors, such as poisons, pesticides, waste gas, sewage, etc.
2. Behavioral lifestyle factors: refers to the health risk factors caused by one's own behavioral lifestyle, which are called self-created risk factors. Behavioral lifestyle is closely related to common chronic diseases or social diseases. Bad behaviors and lifestyles include smoking, drinking, staying up late, abusing poison, unreasonable diet, lack of exercise, unreasonable driving and so on.
3. Biological genetic factors: including diseases directly related to heredity and diseases in which heredity interacts with other risk factors, such as age, sex, race, genetic history of diseases, height and weight, etc.