Hypoglycemia is a term used to describe a blood sugar concentration of less than 70 milligrams per deciliter. In ferrets, this is most commonly caused by an insulinoma, a tumor of the pancreas. These tumors produce large amounts of insulin, which causes the blood sugar to drop below normal levels, resulting in symptoms of generalized weakness progressing to severe illness and seizures. The cause of insulinoma is poorly understood, but it appears to affect the pancreas of older ferrets. Ferrets who are diagnosed with insulinomas require treatment for the remainder of their lives.
To learn more, read Hypoglycemia in Ferrets.