Hyperglycaemia (high blood glucose)
You have hyperglycaemia if your blood glucose level is higher than your target range. Your target range is likely to be 4-7mmol/L. High blood glucose can occur when your food, activity and medication are not balanced. It can also happen when you are unwell or under stress. If you have Type 2 diabetes, reduced insulin production or insulin resistance stops glucose travelling into your cells and muscles. This stimulates your liver to release more glucose, which causes your blood glucose level to rise. If there is no fuel or energy going into your cells, you may feel tired. You will need extra fluid to dilute the glucose, which will make you thirsty. The only way your body can get rid of this excess glucose is through your urine. It is this symptom that gave diabetes its full medical name of "diabetes mellitus". Diabetes means "flowing through" and mellitus means "sweet as honey". The condition was named after the high volume of urine laden with sugar that is found in people with untreated diabetes. The extra fluid your body uses to dilute your high blood glucose level can also make you dehydrated, which will leave your skin feeling dry.