What should you know about causes of tiredness during pregnancy?

Pregnancy changes circulation, metabolism, sleep, and the work required by the body, so energy may vary across different stages. Nausea, discomfort, frequent urination, anxiety, and interrupted sleep can leave you drained. Dehydration can cause weakness, headache, dizziness, or dark urine. Anaemia may cause marked tiredness, breathlessness on exertion, headaches, or a fast heartbeat. Infection can also lower energy; fever, cough, sore throat, urinary symptoms, or exposure to COVID-19 are useful clues. Less common contributors include coeliac disease, chronic kidney disease, burnout, or an existing fatigue disorder. Alcohol use can worsen sleep and health during pregnancy and should be discussed confidentially with a clinician.

Tiredness alone does not identify one cause. The timing, severity, sleep quality, diet, fluid intake, medicines, and associated symptoms guide the assessment.

Rest when possible, keep a regular sleep routine, drink fluids regularly, and eat small balanced meals if nausea limits portions. Gentle activity may help if your maternity team has said it is suitable. Ask before taking iron, herbal products, or other supplements; treatment should match your test results and pregnancy needs. Keep prenatal appointments and mention tiredness that is new, severe, or preventing normal activities.

Seek urgent help for severe breathlessness, chest pain, fainting, confusion, heavy bleeding, severe headache with vision changes, or sudden marked swelling. Contact your maternity team promptly for fever, inability to keep fluids down, very little urine, palpitations, breathlessness at rest, or fatigue that is rapidly worsening. A clinician may check blood count, thyroid function, infection, hydration, and other causes.

Ask whether your symptoms could indicate anaemia, dehydration, infection, or another condition, and which tests are appropriate. Discuss safe activity, nutrition, sleep support, supplements, and signs that should prompt same-day advice.