Feet swelling and high blood pressure: what to know

High blood pressure often has no noticeable symptoms. Swelling around the feet or ankles therefore should not be used to judge whether blood pressure is high or controlled. A clinician may need to check your blood pressure, medicines, heart function and kidney health.

Fluid can collect in the feet when circulation is affected, when the kidneys retain more salt and water, or after sitting or standing for a long period. Heart failure can also cause swelling, often alongside breathlessness, tiredness or a rapid increase in body weight. Chronic kidney disease may cause swelling and changes in urination.

Some blood-pressure medicines, including certain calcium-channel blockers, can contribute to ankle swelling. Do not stop a prescribed medicine on your own; the prescriber can decide whether the dose or treatment needs review. Swelling in one foot, especially with pain, warmth or redness, has different possible causes from swelling in both feet.

Arrange a medical review if the swelling is new, persistent, worsening, or has appeared after a medicine change. Note when it started, whether one or both feet are affected, whether it is worse by evening, and any breathlessness or change in urination.

Keep taking prescribed blood-pressure treatment unless a clinician tells you otherwise. While waiting for advice, avoid prolonged sitting or standing, take gentle walks if comfortable, and raise your legs when resting. Avoid starting water tablets, reducing fluids sharply, or making a major salt change without professional guidance.

Seek emergency help for swelling with severe or sudden breathlessness, chest pain, fainting, confusion, blue lips, or coughing up blood. These symptoms can indicate a serious heart or lung problem.

Get urgent assessment for a suddenly swollen, painful, warm or red leg, or for swelling accompanied by very high blood pressure and severe headache, vision change, weakness, trouble speaking or new chest discomfort. Do not wait for the swelling to settle if these warning signs occur.

Ask whether your swelling could be related to a prescribed medicine, and whether you need blood and urine tests or a heart assessment. You can also ask what blood-pressure readings to record at home and which symptoms should prompt same-day care.