Are there complications with insulin shots?

Complications may arise from taking insulin.
Insulin is an injectable hypoglycemic drug that is commonly used to treat diabetes. The most common adverse reaction to insulin is hypoglycemia, which can occur if insulin is administered in doses much higher than needed, and can be characterized by hunger pangs, panic attacks, hand tremors, and sweating; severe hypoglycemia can lead to hypoglycemic coma and even death.
Insulin may also have allergy, manifested as skin rash, itching, etc.; insulin is a synthetic hormone, long-term injection of insulin will cause weight gain; when insulin injection sterilization is not strict or repeated application of injection needles, it may cause infection of the injection site, or even the formation of abscess; long-term subcutaneous injection of insulin is prone to lead to the formation of injection site of the hard knots or subcutaneous fat atrophy.
Insulin should be used under the guidance of a doctor and should not be used on its own to avoid serious adverse reactions.