The reasons for the occurrence of type 2 diabetes include genetic and environmental factors. While the chances of type 2 diabetes are influenced by genetic factors, environmental factors are particularly important in the development of type 2 diabetes. Mainly poor lifestyle, such as staying up late, irregular diet, over-nutrition, lack of exercise, etc. may lead to an increased incidence of the disease. The etiology and pathogenesis of type 2 diabetes mellitus are complex, and once it develops, it is often incurable. Therefore, it is important to prevent the disease by adopting a healthy lifestyle, and people with a family history of diabetes should be screened regularly. People who are suspected of having diabetes are advised to seek medical advice and treatment in a timely manner under the guidance of a professional physician to avoid delays in their condition.