Do insulin pens have side effects?

Common side effects of using an insulin pen include: Lipohypertrophy: Lipohypertrophy is a collection of fatty tissue that forms under the skin that occurs due to repeated injections in the same place.

Common Side Effects of Insulin (via pens or other methods):

1. Low blood sugar (hypoglycemia)

   Most common side effectSymptoms: shakiness, sweating, dizziness, confusion, rapid heartbeat

   • Caused by taking too much insulin, skipping meals, or intense exercise

2. Weight gain

   • Insulin helps store glucose, which can contribute to weight gain over time

3. Injection site reactions

   • Redness, swelling, or itching where insulin is injected

   • Usually mild and temporary

4. Lipodystrophy (long-term use)

   • Fatty lumps or indentations can develop at injection sites if the site is not rotated properly

5. Allergic reactions (rare)

   • Itching, rash, or more serious allergic responses to insulin or pen components