The word "hypo" means "low." Hypoglycemia means having a low blood sugar. It can occur in people who take medication to treat their diabetes. But hypoglycemia is usually avoidable.
It's important that, if you do experience a low blood sugar level, you know how to recognize and treat the situation. Prevention of low blood sugar levels is the primary goal.
For useful tips on how to prevent low blood sugar -- and to react properly if it happens -- read the DRI's brochure "Low Blood Sugar-Hypoglycemia" in English or "Azúcar Sanguínea Baja-Hipoglicemia" in Spanish.