An insulinoma is a tumor (growth) on the pancreas. It is usually benign, although it can occasionally be malignant (cancerous). The pancreas is responsible for the production of insulin, a messenger that tells the body to break down sugars to make energy needed for daily life. When there is a tumor on the pancreas, the pancreas may begin to produce too much insulin. When a person has too much insulin, their blood-sugar level can become very low, potentially causing seizures or confusion. Symptoms of insulinomas include anxiety, confusion, dizziness, headaches, and sweating. Treatment for insulinomas is usually surgery to remove the tumor as well as certain medications. With appropriate management, people with insulinomas can live full healthy lives.