If you're a woman living with diabetes, it's like living life on a seesaw. When you eat, your blood sugar level goes up, and when you exercise or take insulin, it goes down. You learn to listen to your body. And you learn to avoid the extreme high and low blood sugar levels that can be harmful to your health.
When the blood sugar is high, not only is more sugar available in body tissue and secretions for food, but the effectiveness of the body's naturally occurring defense is decreased. So the yeast can multiply rapidly and overgrow, causing a yeast infection.
If this is your first yeast infection, don't try to diagnose or treat it yourself. The only way to know for sure is to see your doctor or health care provider. Other kinds of vaginal conditions with symptoms similar to yeast infection may also be present.

A vaginal yeast infection does not cause: fever or chills, lower abdominal, back, or shoulder pain, nausea or vomiting, foul-smelling vaginal discharge, or missed periods. These may be signs of other vaginal conditions, such as a sexually transmitted disease (STD) or a tubal pregnancy. If you have any of these symptoms, contact your doctor or health care provider immediately.