Type 2 diabetes and pregnancy symptoms: what to know

Pregnancy itself can cause tiredness and more frequent urination, while high blood glucose may add marked thirst, dry mouth, blurred vision or recurrent infections. Symptoms alone cannot show whether glucose is in range; testing and clinical review are more reliable.

Type 2 diabetes means the body does not use insulin effectively, allowing glucose to remain in the bloodstream. During pregnancy, hormonal changes can alter insulin needs, even when a previous treatment plan had been keeping glucose controlled.

Feeling unusually thirsty, passing urine often, having recurrent thrush or urinary infections, experiencing blurred vision, or losing weight without intending to can occur with high glucose. Nausea, vomiting and exhaustion also have many pregnancy-related causes, so do not adjust diabetes medicine based on symptoms alone.

Low glucose can cause sweating, shaking, hunger, dizziness, irritability, weakness or confusion. This is more likely to need attention when using insulin or certain glucose-lowering medicines.

Tell your obstetrician, midwife or diabetes team as soon as you know you are pregnant. They can review glucose targets, medicines, monitoring frequency, meals and appointments. Some medicines are changed during pregnancy, so check before starting, stopping or changing any prescription, supplement or over-the-counter product.

Keep a record of glucose readings and symptoms, including when they occur in relation to meals, activity and medicine. Eat regular balanced meals, carry a suitable source of fast-acting glucose if your team advises it, and attend antenatal and eye or kidney checks that are recommended for you.

Seek urgent medical advice for repeated high readings, vomiting that prevents fluids or medicine, severe thirst with dehydration, deep or rapid breathing, abdominal pain, unusual drowsiness or confusion. These symptoms can signal a serious glucose problem during pregnancy.

Call emergency services for fainting, a seizure, severe confusion, chest pain, difficulty breathing, sudden weakness on one side, or trouble speaking. For less urgent concerns, contact your maternity or diabetes team promptly rather than waiting for the next routine appointment.

Ask which glucose readings should prompt a call, how often to test, what to do if you cannot keep food or medicine down, and whether every current medicine is suitable in pregnancy. You can also ask how low glucose should be treated and which symptoms require maternity assessment.