Heavy legs, swollen ankles, night cramps
Legs that feel heavy or ache by the end of the day, ankles that swell, and cramps that arrive in bed are the three complaints that most reliably point to a vein rather than to age or tiredness. The pattern is the clue: better in the morning, worse by evening, better again after a night lying flat. A duplex ultrasound scan of the leg settles it in about fifteen minutes.
The pattern matters more than the symptom
Almost everything on a leg can ache. What makes a symptom venous is not what it feels like, it is when it happens. Venous symptoms are cyclical across the day: fine in the morning, heavier through the afternoon, worst in the evening, and relieved by lying flat overnight. That is because the calf muscle stops pumping when you are still, and the leg has been filling for hours.
Anything that is worst on waking, unchanged by elevation, or triggered by walking a fixed distance and relieved by stopping, is pointing somewhere other than the veins. That distinction is the whole reason the scan exists.
What is actually happening inside the leg
Leg veins carry blood upward against gravity, helped by the calf muscle squeezing them and by one-way valves that stop the blood sliding back between squeezes. When a valve stops sealing, blood falls back down and pools in the vein below it. That vein stretches under the extra volume, which pulls the next valve down open, and the process extends.
The swelling, the ache and the visible vein are all downstream of that one mechanical failure. It is also why treating what is visible on the surface, without finding the failed valve feeding it, is the most common reason people arrive here having already been treated somewhere else with no lasting result.
What it is not
Several things get mistaken for veins, and it is worth naming them plainly rather than letting a patient assume.
| Also causes leg pain | How it differs |
|---|---|
| Artery disease | Pain comes on after walking a predictable distance and stops when you stand still. Elevation makes it worse, not better. |
| Nerve or back problem | Burning, shooting or numb rather than heavy. Often changes with posture or spine position, not with the time of day. |
| Joint or muscle | Tied to a specific movement or a specific spot, and worst on first getting up rather than at the end of the day. |
| Simple dependent swelling | Both ankles equally, after a long flight or a hot day, gone by morning and not progressive. |
| Deep vein thrombosis | One leg, swollen quickly, painful, warm, sometimes red. This is the one that does not wait for a clinic appointment. |
If the last row describes your leg today, go to a hospital rather than book a consultation.
When it is genuinely urgent
Most vein symptoms are uncomfortable rather than dangerous, and they progress over years, not days. Three situations are different and should not wait: a leg that swells suddenly and becomes painful and warm; a vein that has bled and will not settle with elevation and pressure; and a break in the skin near the ankle that is not healing. The first is a possible clot, the second needs the pressure behind it dealt with, and the third is the endpoint that early treatment exists to avoid.
What the scan does about it
A venous duplex ultrasound maps which valves have failed, in which vein, and how far the reflux runs. It takes about fifteen to twenty minutes, involves no needles and no dye, and it is done in the same visit as the consultation. It is the only thing that decides the treatment; the appearance of the leg does not, which is why a leg with barely visible veins can need more than one covered in them.
If the scan shows nothing venous, you are told that, and told what to see instead. That is a better outcome than a treatment aimed at the wrong problem.
References
- National Institute for Health and Care Excellence. Varicose veins: diagnosis and management, clinical guideline CG168. Published 24 July 2013, last updated 2 August 2024. nice.org.uk/guidance/cg168
- Society for Vascular Surgery / American Venous Forum. Clinical practice guidelines for the management of varicose veins of the lower extremities. Journal of Vascular Surgery: Venous and Lymphatic Disorders, 2023.
- Cochrane Database of Systematic Reviews. Injection sclerotherapy for varicose veins and related reviews of endovenous ablation.
Clinical guidance changes. This page states the date it was last reviewed, and the sources it draws on are dated.
What each symptom usually means.
| What you feel | What it usually points to | How soon to have it looked at |
|---|---|---|
| Heaviness or aching that builds through the day | Valves in a leg vein no longer sealing, so blood pools instead of climbing | Routine. Book a scan |
| Ankle swelling, one leg more than the other | Blood leaving the leg inefficiently. Occasionally something deeper | Soon |
| Cramps or restlessness at night | Venous pressure, far more often than the magnesium it gets blamed on | Routine |
| Itching or eczema over a visible vein | Long-standing pressure irritating the skin | Soon. Skin change is a later stage |
| Brown staining of the skin near the ankle | Blood pigment deposited under years of pressure | Soon. This precedes ulceration |
| A vein that bleeds after a knock | A thin-walled surface vein under pressure | Lie down, raise the leg, press. Then be seen |
| Sudden swelling of one whole leg with pain and warmth | Possibly a clot in a deep vein, which is not a cosmetic matter | Same day, at a hospital |
Times are what actually happens in this clinic, not industry averages. Which technique a leg needs is decided by the duplex scan, never by how the leg looks.
Common questions.
Why do my legs hurt more at night?
After a day upright, blood has been pooling in the leg and the vein has been under pressure for hours. When you lie down the calf muscle stops pumping and the leg is at its most swollen, so the discomfort peaks in the evening and at night.
It is not dangerous that night, but it does not resolve on its own, and the daily rhythm of it is exactly what distinguishes a venous cause from a muscular one.
Are night cramps really caused by veins?
Night cramps get blamed on magnesium and dehydration far more often than they should be. When they arrive alongside heaviness, swelling or visible veins, the cause is usually circulation rather than diet.
They tend to settle once the pressure inside the failing vein comes down. A scan is what tells you which of the two you are dealing with.
Can a varicose vein burst?
A surface vein under long-standing pressure has a thin wall and can bleed after a knock, or occasionally on its own. It looks alarming because venous bleeding is steady rather than pulsing.
Lie down, raise the leg above the level of the heart and press firmly on the point. That stops it. Then have the pressure behind it dealt with, because a vein that has bled once will bleed again.
Is heavy, aching leg pain serious?
In itself, usually not. Venous symptoms progress over years rather than days.
What makes it worth acting on is that it does not reverse on its own, and that the later stages — skin staining, then ulceration — are considerably harder to treat than the early ones.
The exception: sudden swelling of one whole leg, painful and warm, needs same-day hospital assessment rather than a clinic appointment.
Keep reading.
Bring the leg in.
The consultation includes the ultrasound scan, the diagnosis and an exact quote. You decide after that, not before.
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