Hypoglycemia - Symptoms and causes - Mayo Clinic

Hypoglycemia is a condition in which your blood sugar (glucose) level is lower than the standard range. Glucose is your body's main energy source. Hypoglycemia is often related to diabetes treatment. But other drugs and a variety of conditions — many rare — can cause low blood sugar in people who don't have diabetes.

source https://www.mayoclinic.org/diseases-conditions/hypoglycemia/symptoms-causes/syc-20373685