Heavy legs and varicose veins are not the same complaint

Two patients on the same morning. The first has ropes of vein visible from the knee down and no symptoms at all; she has come because of how it looks in summer. The second has legs that ache and feel heavy by late afternoon, swell into the sock line, and show almost nothing on the surface. Both have been told elsewhere that they have varicose veins. Only one of them has a leg I am worried about, and it is not the one with the visible veins.

This is the most common misunderstanding about venous disease of the legs, and it is reinforced by how the condition is advertised. What a patient can see and what a patient can feel are two separate measurements, and neither of them is the measurement that decides treatment.

A spectrum, not a diagnosis#

Chronic venous insufficiency of the lower limbs manifests across a clinical spectrum that runs, as the Korean Journal of Internal Medicine review of the subject puts it, from asymptomatic but cosmetic problems to severe symptoms such as venous ulcer. That sentence does a lot of work. It means the same underlying condition can present as something a patient wants hidden under trousers and as something that will not heal.

The system that keeps those apart is the CEAP classification, revised by international consensus in 2004 and used since. Its clinical axis grades the leg itself.

A patient at C1 or C2 with no symptoms has a cosmetic question, and it is a legitimate one to have. A patient at C4 has skin that is being damaged by venous pressure, and the clock on that is different. The two are not points on a severity scale of the same complaint; they are different clinical problems that happen to share a cause.

Why the ultrasound is not optional#

Neither the look of the leg nor the symptoms tell you where the problem is. Duplex ultrasound does. Two of the standing guidelines on chronic venous disease — the European Society for Vascular Surgery guidance of 2022 and the Society for Vascular Surgery and American Venous Forum guidance that preceded it — put it at the centre of assessment rather than inspection, and so does the Korean review. It shows which vein is incompetent, over what segment, and whether the deep system is involved, and those are the facts any treatment has to be aimed at.

Heavy legs have other causes#

A leg that aches and feels heavy by evening is a common presentation and venous disease is one explanation among several. Standing occupations, obesity, musculoskeletal problems, lymphatic causes and medication-related oedema all produce it, sometimes alongside venous reflux and sometimes instead of it. Treating a vein in a leg whose symptoms come from somewhere else produces a patient with a treated vein and the same symptoms, which is a specific kind of failure and an avoidable one.

The Edinburgh Vein Study established how common varicose veins and chronic venous insufficiency are in a general population rather than in a clinic population, which matters because a finding common in the healthy population is a weak explanation for an individual's symptoms on its own.

The Korean context, and why it is moving#

The review in the Korean Journal of Internal Medicine makes two observations about this country that fit what I see. The first is that chronic venous insufficiency is often overlooked, because the magnitude of the problem is underappreciated and its range of presentations is incompletely recognised. The second is that its prevalence here is expected to increase, given probable underdiagnosis together with rising obesity and an ageing population.

Those two facts pull in opposite directions in a consulting room. The condition is under-recognised when it is causing damage, and over-treated when it is not. The corrective for both is the same: stage the leg, scan it, and then decide.

The findings that end the cosmetic conversation#

• Skin changes above the ankle — pigmentation, eczema, or the hardened skin of lipodermatosclerosis.
• An ulcer, whether open or healed, anywhere in the gaiter area.
• Bleeding from a varicosity, which happens with trivial trauma once the vein is superficial and thin-walled enough.
• Superficial thrombophlebitis in a varicose vein, which warrants assessment rather than reassurance.
• Swelling that no longer settles overnight.

Any of those in a leg makes the question medical regardless of how the veins look, and their absence in a leg full of visible veins makes it reasonable to do nothing at all. I say that second part out loud more often than the first, because patients arrive expecting that visible veins commit them to a procedure, and most of the time they do not.