Diabetes mellitus, or diabetes, refers to a group of diseases that affect how your body uses blood glucose, commonly called blood sugar. Glucose is vital to your health because it's an important source of energy for the cells that make up your muscles and tissues.
The three main types of diabetes are type 1, type 2, and gestational (diabetes while pregnant). If you have diabetes, it means you have too much glucose in your blood, which can lead to serious health problems.
If you notice any possible diabetes symptoms, such as increased thirst or frequent urination, call your doctor immediately.