Pregnancy and a swollen leg: what should you know?

Pregnancy can increase fluid retention and make swelling more noticeable later in the day, especially around the ankles. Standing for long periods, heat, and reduced movement may add to it. Swelling that is mainly on one side, develops quickly, or comes with calf tenderness can signal a blood clot. Marked swelling with headache, vision changes, or upper abdominal pain can accompany a pregnancy blood-pressure problem.

Rest with your legs supported, avoid standing still for long periods, move your ankles gently, and wear comfortable shoes. Drink normally and avoid taking water tablets or supplements for swelling unless prescribed. Note whether both legs are affected, when swelling appears, and whether skin colour, warmth, or pain changes. Mention recurring swelling at antenatal appointments.

Seek emergency care for sudden breathlessness, chest pain, coughing blood, fainting, or a rapidly painful, warm, one-sided leg. Contact your maternity team urgently for sudden marked swelling, severe headache, vision changes, or pain beneath the ribs. Arrange review for persistent swelling, skin changes, or symptoms that interfere with walking.

Ask whether your blood pressure, urine, and leg need checking, whether compression is suitable, and which activity is safe. Ask how to distinguish ordinary ankle swelling from a clot or another condition.