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Symptoms and Signs of Type 2 Diabetes

Doctor's Notes on Type 2 Diabetes

Type 2 diabetes is a chronic condition in which there is an elevated level of sugar (glucose) in the bloodstream due to the body's inability to properly respond to insulin. Insulin is a hormone produced in the pancreas that allows the body to utilize glucose for energy. Elevated blood glucose levels are called hyperglycemia. Type 2 diabetes is different from type 1 diabetes, a condition in which the body is unable to produce enough insulin.

Early symptoms of type 2 diabetes in some people who do not know they have the disease may include erectile dysfunction, blurred vision, or numbness, tingling, or pain in the extremities. Symptoms of poorly controlled or undiagnosed 2 diabetes include frequent urination, thirst, dehydration, weight loss, fatigue, nausea, vomiting, frequent or slow healing skin sores, frequent infections, kidney infections, or urinary tract infections (UTIs).

Medical Author: John P. Cunha, DO, FACOEP
Medically Reviewed on 3/11/2019


Kasper, D.L., et al., eds. Harrison's Principles of Internal Medicine, 19th Ed. United States: McGraw-Hill Education, 2015.