what illnesses affect blood sugar
affects your body. Sometimes, however, no matter how hard you try, things go wrong. Infection or an illness such as a cold or. the flu, for instance, can cause high blood sugars, loss of diabetes control, and and if you have type 1 diabetes may result in a. condition known as ketoacidosis. If you have type 2 diabetes, ketoacidosis is rare but you may experience very high blood sug-.