Blood glucose or ‘sugar’ is an important energy source for our bodies but too much can be harmful to your health. When the amount of sugar in the blood becomes higher than normal, this is called Diabetes. Symptoms of Type 2 Diabetes can include being thirsty and feeling tired all the time. If you are concerned about any of these symptoms, a simple blood test can be carried out to diagnose diabetes or identify whether you may be at risk of diabetes.