Leg and ankle swelling

What it is

Fluid constantly moves out of capillaries into the tissue and is returned by the veins and lymphatics. Standing or sitting still for hours means gravity favours the outward direction and the return mechanism - largely the calf muscle pump - is switched off.

Simple dependent oedema is common, symmetrical, worse in the evening and gone by morning. Swelling that is one-sided, sudden, painful, or that does not settle overnight is a different matter entirely and needs assessment: heart, kidney, liver and clotting problems all present this way.

What it feels like

• Ankles and feet puffy by evening, with sock marks
• Better in the morning after a night lying flat
• A dent that stays for a moment when pressed
• Shoes tighter at the end of the day than at the start
• Heavy, tired legs alongside the swelling

What causes it

Most people have more than one of these at once, and they feed each other. Read the list looking for the two or three that sound like your week rather than for the one true answer — the ones that describe you are the ones worth acting on.

Gravity plus an idle calf pump

Standing or sitting still for hours allows fluid to accumulate in the lowest tissue with nothing pushing it back. This is the mechanism behind ordinary evening swelling and it responds immediately to walking.

Venous insufficiency

Failed vein valves keep pressure in the leg veins high, which pushes more fluid out into the tissue. It is the commonest pathological cause of chronic leg swelling.

Prolonged sitting, particularly travel

Long flights and drives combine immobility, a bent knee and cabin conditions. The swelling is usually harmless; the clot risk is the reason to move.

Heat

Warm weather dilates the superficial vessels and increases fluid movement into the tissue. Many people only swell in summer, which is normal.

Medications

Calcium channel blockers such as amlodipine are a very common cause and are frequently not recognised as one. Steroids, some diabetes drugs, gabapentin and anti-inflammatories all contribute.

Heart failure

A failing heart cannot clear the returning volume, so pressure backs up into the veins. This swelling is usually symmetrical, worse with breathlessness, and does not fully settle overnight.

Kidney or liver disease

Both alter the protein content of blood and the handling of salt and water. Swelling from these tends to be more generalised, sometimes including the face or the abdomen.

Lymphoedema

Damage to the lymphatic system, often after cancer surgery or radiotherapy, produces swelling that is typically one-sided, firm, does not pit easily and includes the toes.

Deep vein thrombosis

One leg suddenly swollen, warm, painful and tight is a clot until proven otherwise. This is a same-day emergency and it is the reason one-sided swelling is never in the routine category.

Pregnancy

Increased volume, hormonal vessel relaxation and pressure from the uterus all contribute. Mild swelling is normal; sudden swelling of the face and hands with headache or visual changes may be pre-eclampsia and is urgent.

Who tends to get it

• Anyone whose job involves prolonged standing or sitting
• People taking calcium channel blockers for blood pressure
• Older adults, in whom several contributing factors often coexist
• Anyone with venous insufficiency, heart, kidney or liver disease
• Pregnant women, particularly in the third trimester

What makes it worse, and what settles it

The qFIT routine for this

Ready-made routineCirculation & Swollen Legs

qFIT already has this one built. It runs massage first, then stretching, then strength — the order that works on a body that is already sore — and every activity in it carries the reason it is there.

The button below opens your Checklist with this routine already selected, so instead of your whole list you land on just its Categories, Targets and Exercises, each with its checkbox, ready to tick as you work through them.

Have more than one problem? Tick yours under My Problems on My Profile and your Checklist's Routine list gains Recommended for my problems — every routine for the problems you picked, merged into one. Your picks stay private; that filter is the only thing they feed.

Get it checked if…

Sudden one-sided swelling with pain or warmth - possible DVT, urgent, no massage; bilateral swelling with breathlessness - cardiac or renal, urgent

And whatever the body part: chest pain or unusual breathlessness on exertion; a fever alongside the pain; unexplained weight loss; pain that is constant and unrelated to how you move; new numbness, weakness or loss of bladder or bowel control; or one calf that is swollen, warm and painful. Any of those, stop and get assessed.

How it usually goes

Simple dependent swelling responds within days to movement, elevation and compression. Where a medication is the cause, changing it usually resolves it completely and is worth asking about. The important thing on this page is the triage rather than the treatment: swelling that is one-sided, sudden, painful, that comes with breathlessness or chest pain, or that does not settle overnight needs medical assessment promptly rather than a calf-raise programme.

Prevalence basis: Occupational health and primary-care data

Others the same routine covers

These share the Circulation & Swollen Legs routine, so the work is the same. If one of them also sounds like you, that is a reason to expect more from it, not less.

This is general information, not a diagnosis, and it cannot examine you. If it matches you, use it to ask better questions of a clinician rather than to replace one.