Varicose veins: what compression can and cannot do
Updated 2 September 2026 · 7 min read
Varicose veins are failed one-way valves: blood pools, veins widen, legs ache and swell. Graduated class II compression (23–32 mmHg) is the first-line conservative treatment — it narrows the vein from outside so the remaining valves close again, relieving pain, heaviness and swelling and slowing progression. What it cannot do is make an existing varicose vein disappear; that takes a procedure. Wear it daily, and have the diagnosis confirmed by a phlebologist.
What actually goes wrong in the vein
Leg veins carry blood uphill through a chain of one-way valves. When a valve stops closing — through genetics, pregnancy, standing work, age — blood falls back down and pools in the segment below. The vein widens under the load, which pulls the next valve apart, and the cascade continues: a visible, twisted varicose vein, evening heaviness, swelling around the ankle, sometimes itching or cramps.
Where compression genuinely helps
A graduated class II stocking squeezes the widened vein back toward a diameter where the remaining valves can meet and close. Pooling decreases, the muscle pump works against sensible resistance again, and the day-to-day symptoms — aching, heaviness, swelling — improve measurably. Consistent daily wear also slows progression and is the standard companion before and after vein procedures.
This is why class II, not class I, is the clinical standard once varicose veins are diagnosed: the failed vein needs the higher working pressure. Class and length are best confirmed by a phlebologist, who will also check that your arteries are healthy enough for compression.
The honest limits
Compression is management, not reversal. A stocking cannot shrink an established varicose vein away — removal takes a procedure such as endovenous ablation or sclerotherapy. Think of compression as the daily control layer: it keeps symptoms and progression in check, whether or not you ever choose a procedure, and it is the required aftercare when you do.
Living with it in practice
- On in the morning before swelling builds, off in the evening — every day, not just bad days.
- Knee-highs cover most below-knee varices; veins reaching the thigh call for thigh-highs or pantyhose.
- Expect the first week to feel like work; a correctly sized class II becomes routine by week two.
- Re-measure once a year — legs change, and a stretched-out or mis-sized stocking is a placebo.
Frequently asked
Can compression stockings cure varicose veins?
No. They control symptoms and slow progression — often very well — but an established varicose vein only disappears with a medical procedure. Compression remains the standard before and after such procedures.
Class I or class II for varicose veins?
With a diagnosis, class II (23–32 mmHg) is the European clinical standard. Class I is the prevention class — right for heaviness and first spider veins before any diagnosis.
Do I still need a doctor if the stocking helps?
Yes — once at the start, to confirm the diagnosis, rule out arterial disease and set the class. After that, an annual check keeps the plan honest, and any sudden pain, hard swelling or skin change goes straight back to the doctor.
