Why does hypoglycaemia cause nausea?

Glucose is an important fuel for the brain. When its level falls, the body releases hormones such as adrenaline to raise it. Those hormones can produce sweating, shakiness, a racing feeling in the chest, anxiety and an unsettled stomach. Nausea is a common presentation of Hypoglycaemia, but nausea can also have many other causes. A person may feel hungry, weak, dizzy or irritable at the same time. Symptoms can develop when a meal is delayed, after exercise, during illness, or when diabetes medicines lower glucose more than intended.

If you are awake, can swallow safely, and think your glucose may be low, check it if you have a meter or sensor. Follow the low-glucose plan provided by your diabetes team. Take a fast-acting source of glucose if your plan advises it, then recheck according to that plan. Once you feel better, consider whether a planned meal or snack is needed. Do not drive, use machinery, or stay alone if you are confused, very drowsy or unsteady. Record what happened, including food, activity and medicines, to discuss with your clinician.

Get emergency help if the person is unconscious, having a seizure, unable to swallow, becoming increasingly confused, or does not improve after the treatment in their plan. Do not give food or drink by mouth to someone who cannot swallow safely. Repeated episodes, nausea that prevents eating or drinking, or low glucose without an obvious explanation need prompt medical review. A clinician can check whether medicine timing, meals, alcohol, illness or another health problem is contributing.

Ask what glucose level should trigger your personal action plan, which fast-acting glucose option suits you, and when to use prescribed rescue treatment. Ask whether your current medicines need adjustment after an episode, especially if symptoms occur overnight, after activity or when you are unwell.