Adverse reactions may occur after treatment with insulin, but they are generally not harmful. Insulin is a drug commonly used in the treatment of diabetes and is administered by injection; it is contraindicated in patients who are allergic to insulin, hypoglycemic, etc.; adverse reactions such as hypoglycemia, atrophy and sclerosis of the subcutaneous fat, adipose tissue hyperplasia, and edema may occur after the use of the drug. Therefore, the use of insulin treatment may have certain adverse reactions, but usually does not harm the body; need to use insulin treatment of patients should be under the guidance of the doctor to standardize the use of medication can be, if the use of medication after the emergence of any uncomfortable symptoms can go to the hospital for medical treatment.