Hypoglycaemia means low glucose in the blood.
For people with diabetes, low blood sugar (hypoglycaemia) occurs when there is too much insulin and not enough sugar in the blood.
A number of factors can cause hypoglycaemia in people with diabetes, including taking too much insulin, missing a meal, alcohol consumption or strenuous exercise.
Signs of hypoglycaemia vary, but can include weakness, trembling or shaking, sweating, headache, lightheadedness, lack of concentration and a rapid pulse. If left untreated, signs may continue to drowsiness, coma and fitting.
The opposite of hypoglycaemia is hyperglycaemia, which occurs when blood glucose levels are too high.