INS and diabetes mellitus: It shows that among reasons for not using insulin, the cost of insulin, fear of hypoglycemia, and considering insulin not good for health was more common in those people with T2DM who did not receive previous diabetes education while fear of injection, complexity, lumps at the injection site, no effect on glycemic control, and negligence (forgetfulness) were found more in those who had received previous diabetes education (p=0.012).