Medical emergency? Call 911 in the U.S. or your local emergency number. This website is for education, not diagnosis.

Glucose health center

Diabetes

Understand diabetes types, symptoms, testing, glucose management, complications, prevention, and care-team questions.

What diabetes is

Diabetes occurs when blood glucose is too high because the body does not make enough insulin, makes none, or does not use insulin effectively. The main types are type 1, type 2, and gestational diabetes. Prediabetes means glucose levels are above normal but not yet in the diabetes range.

Symptoms and testing

Possible symptoms include increased thirst and urination, fatigue, blurred vision, unexplained weight loss, slow-healing wounds, and recurrent infections, but many people have no symptoms. Diagnosis uses blood tests such as A1C, fasting plasma glucose, oral glucose tolerance testing, or random plasma glucose in the right clinical setting.

Daily management

Know the ABCs

A1C, blood pressure, and cholesterol are often managed together to lower complications.

Create a care system

Food, activity, medicines, glucose monitoring, sleep, foot care, eye care, kidney care, and appointments all matter.

Urgent glucose problems

Low or very high glucose can become dangerous.People taking insulin or certain diabetes medicines should know their personal low-glucose plan. Vomiting, deep breathing, confusion, severe dehydration, or inability to keep fluids down may require emergency evaluation.

Questions for your team

  • What are my personal glucose and A1C targets?
  • How do my medicines work and what can cause low glucose?
  • When should I check blood glucose?
  • Which eye, foot, kidney, dental, vaccine, and heart checks do I need?
  • What should I do when sick, traveling, fasting, or exercising?

Go to the source

Trusted organizations

Use these official resources for detailed, updated information and patient materials.

Verified source

NIDDK Diabetes

Detailed patient education on diabetes, tests, management, prevention, and complications.

Visit official source ↗
Verified source

CDC Diabetes

Public-health guidance, prevention programs, statistics, and living with diabetes.

Visit official source ↗
Verified source

MedlinePlus Diabetes

Plain-language information on diabetes medicines, tests, and self-care.

Visit official source ↗