Swelling legs during the third trimester: what to know

As pregnancy progresses, the growing uterus can slow blood returning from the legs. Hormonal changes also encourage fluid to move into tissues, so ankles, feet, and fingers may feel tight. Warm weather and standing for long periods can make this more noticeable. Swelling that affects both sides and develops gradually is often part of these changes.

A sudden increase, especially in the face or hands, can be a warning sign of a pregnancy complication. One leg that is painful, hot, red, or much larger than the other also needs assessment. Conditions such as Varicose Veins can cause local swelling, but the pattern and accompanying symptoms matter.

Rest on your side, raise your feet when sitting, and avoid standing still for long periods. Gentle walking and ankle movements can support circulation when your maternity team considers them safe. Choose roomy shoes and avoid tight bands around your ankles. Drink normally rather than restricting fluids, and never use water tablets unless prescribed.

Keep antenatal appointments and mention swelling at your next review, even if it is mild. The Swollen Ankles page explains how to describe changes in distribution and timing.

Call your maternity unit promptly if swelling appears suddenly or is accompanied by a severe headache, blurred vision, pain under the ribs, nausea, or a high blood-pressure reading. Seek urgent help for one-sided leg pain and swelling, chest pain, sudden breathlessness, fainting, or coughing blood. Do not wait for a routine appointment with these symptoms.

Ask your clinician: Is my swelling pattern expected? Should my blood pressure and urine be checked today? Are compression garments appropriate for me? Which symptoms should prompt a call at night, and how can I stay active safely?