VenousPublished: June 2026·Updated: June 2026·8 min read

Heavy Aching Legs: Is It Your Veins? Singapore Guide

How long does sclerotherapy take to work? It is the question we hear most often after a leg vein diagnosis at our Singapore clinic — but for many patients, the more pressing question is whether their symptoms actually point to veins in the first place. Heavy, aching legs that build through the afternoon, ankle swelling by evening, a dragging sensation after standing in a queue — these are classic features of chronic venous disease, yet they are routinely attributed to tiredness, poor fitness, or simply getting older. A duplex ultrasound scan can answer the question definitively in 20 minutes. The good news is that treatment works well. The even better news is that it often begins working sooner than patients expect.

Dr. Peter Chang

Triple Board-Certified Cardiologist & Vascular Specialist

What Is Actually Making Your Legs Feel Heavy?

The veins in your legs face a mechanical challenge that no other veins in the body share: they must return blood upwards against gravity, relying on a system of one-way valves and the calf-muscle pump. When the valves fail — a condition called venous reflux — blood pools in the lower leg under sustained pressure. This raised venous pressure causes fluid to leak into surrounding tissue, activating inflammatory pathways that produce the characteristic constellation of leg heaviness, aching, throbbing, and swelling that worsens as the day progresses and eases overnight with the legs elevated.

This is chronic venous disease, and it affects an estimated 25–40% of the adult population in developed countries. In Singapore, where commutes are long and many occupations involve prolonged sitting or standing, we see it frequently at our vascular clinic at Paragon Medical Centre — often in patients who have been managing the symptoms quietly for years.

The CEAP Scale: How Doctors Grade What Is Going On

Vascular specialists use the CEAP classification — developed by an international consensus committee — to grade chronic venous disease on a scale from C0 to C6. It is worth knowing because it directly determines the treatment pathway.

C0: No visible or palpable signs of venous disease, but symptoms present.
C1: Spider veins or reticular veins.
C2: Varicose veins (3mm or wider).
C3: Oedema (leg swelling) attributable to venous disease.
C4: Skin changes — hyperpigmentation, venous eczema, lipodermatosclerosis.
C5–C6: Healed or active venous ulcers.

One important nuance highlighted by the ESVS 2022 guidelines: all CEAP classes from C0S to C6 can present with the same symptoms of heaviness and aching. Symptoms do not reliably correlate with disease severity — a patient with C1 spider veins may have more discomfort than one with C3 oedema. This is why a duplex ultrasound is essential, not optional.

Symptoms That Point to Your Veins — Not Just Tiredness

The hallmark of venous-origin leg heaviness is its diurnal pattern: symptoms build through the day and improve with rest or elevation. This contrasts with arterial disease, where pain typically worsens with exercise and is relieved by rest, and with musculoskeletal causes, where pain is more positional and related to movement rather than posture duration.

In Singapore, patients frequently describe a marked worsening after a long commute standing on the MRT, after a full day at a desk, or after an afternoon spent in a shopping mall. The end-of-day ankle swelling that disappears overnight is particularly characteristic. Nocturnal leg cramps, itching over varicose veins, and a restless sensation in the legs at night are additional features that often accompany venous disease — and are frequently not connected to the veins by the patient.

Heaviness and aching that build through the day and improve overnight
Ankle and lower-leg swelling that is worse in the evening
Itching or burning over visible veins or discoloured skin
Nocturnal leg cramps or restless legs at night
Symptoms worsen in heat, after prolonged standing, or after long flights — all common in Singapore

Diagnosing Venous Disease in Singapore: The Duplex Ultrasound

The ESVS 2022 Clinical Practice Guidelines on Chronic Venous Disease recommend full lower-limb duplex Doppler ultrasound as the standard investigation for diagnosis and treatment planning. Clinical examination alone is insufficient: approximately 30% of patients with significant saphenous reflux have no visible varicose veins.

At Paragon Medical Centre on Orchard Road, the duplex scan is performed in the clinic. It takes 20–30 minutes, is entirely non-invasive, and maps the great saphenous vein, small saphenous vein, perforating veins, and any incompetent tributaries. The scan identifies both reflux (backward flow) and obstruction, assigns a CEAP class, and directly informs whether compression alone is appropriate or whether an interventional procedure — sclerotherapy, RFA, EVLA, or VenaSeal — is indicated. There is no reason to spend months on compression stockings alone when the anatomy can be mapped in a single appointment.

How Long Does Sclerotherapy Take to Work? The Honest Timeline

The timeline depends on what is being treated. Sclerotherapy works by injecting a chemical agent that damages the vein wall, causing it to close and be reabsorbed by the body. Reabsorption takes time — this is not a procedure where the vein disappears on the table.

For spider veins (telangiectasias), visible improvement typically appears within 3–6 weeks. For small-to-medium varicose veins, the treated vessel fades progressively over 3–4 months. For foam sclerotherapy targeting larger veins or truncal tributaries, full clinical effect takes 3–6 months — confirmed by a peer-reviewed study showing measurable reduction in great saphenous vein diameter at post-procedure day 90. Symptomatic improvement — reduced heaviness, aching, and swelling — often precedes visible cosmetic improvement by several weeks. Most patients notice their legs feel lighter within 2–4 weeks of treatment, even before the vein fully fades.

Spider veins: visible fading within 3–6 weeks
Small-to-medium varicose veins: fade progressively over 3–4 months
Foam sclerotherapy (larger veins): full effect at 3–6 months; GSV diameter reduced at day 90 (PMC study)
Symptom relief (heaviness, aching): often noticeable within 2–4 weeks — before cosmetic improvement
Multiple sessions may be required for extensive disease; spaced 4–6 weeks apart

Compression Stockings: What They Do and What They Cannot Do

The ESVS 2022 guidelines recommend compression therapy for all symptomatic chronic venous disease, regardless of CEAP class. The minimum pressure for symptom relief is 15 mmHg; for oedema (C3) and early skin changes (C4), the recommended range is 20–40 mmHg (Class II graduated compression stockings).

Compression works by supporting the calf-muscle pump, reducing venous pooling, and attenuating the raised venous pressure that drives fluid leakage. For patients in Singapore whose work involves prolonged standing, compression stockings worn from morning to end of shift can substantially reduce end-of-day leg heaviness and swelling. What compression cannot do is correct underlying valve incompetence — for that, a procedure is required. But as an adjunct to treatment and as a long-term preventive measure, compression is under-used and under-appreciated.

When to See a Vascular Specialist in Singapore

A vascular specialist review is appropriate whenever leg symptoms are affecting quality of life — which, for most patients with chronic venous disease, happens long before any skin changes appear. The ESVS guidelines recommend specialist referral for CEAP C4–C6 and suggest it for C3 with extensive oedema. In practical terms: if your legs ache enough to interrupt sleep, if you find yourself sitting down more than you otherwise would, or if you plan activities around your leg symptoms, it is worth a duplex ultrasound and a conversation.

We see patients at Paragon Medical Centre, Orchard Road, who have been living with daily leg heaviness for years, assuming nothing can be done. In most cases, something can be done — and the question of how long sclerotherapy takes to work, or whether a more definitive procedure is needed, is one we can answer clearly after a single appointment.

Frequently Asked Questions

Common Questions About Heavy Aching Legs

How long does sclerotherapy take to work?

It depends on what is being treated. Spider veins typically show visible improvement within 3–6 weeks. Small-to-medium varicose veins fade over 3–4 months. Foam sclerotherapy for larger veins reaches full effect at 3–6 months, with measurable vein diameter reduction confirmed at 90 days in clinical studies. Symptom relief — reduced heaviness and aching — often precedes visible cosmetic improvement by several weeks.

Is leg heaviness a sign of venous insufficiency in Singapore?

It is one of the most common signs, yes. Venous-origin leg heaviness has a characteristic pattern: it builds through the day, worsens with prolonged standing or sitting, and improves overnight with the legs elevated. Ankle swelling that disappears by morning is a particularly reliable indicator. A duplex ultrasound at a vascular clinic in Singapore can confirm or exclude venous reflux definitively in under 30 minutes.

What is the CEAP classification for venous disease?

CEAP classifies chronic venous disease from C0 (symptoms only, no visible signs) through C6 (active venous ulcer). C1 is spider veins; C2 varicose veins; C3 oedema; C4 skin changes; C5 healed ulcer; C6 active ulcer. Importantly, any class from C0 upward can cause leg heaviness and aching — symptoms do not reliably predict severity, which is why imaging is essential before treatment planning.

Can compression stockings fix leg heaviness in Singapore?

Compression stockings significantly reduce leg heaviness, swelling, and aching — the ESVS guidelines recommend a minimum of 15 mmHg for all symptomatic venous disease. But they manage symptoms rather than correct the underlying valve incompetence driving them. For lasting relief, a procedure (sclerotherapy, RFA, EVLA, or VenaSeal) addressing the reflux source is usually needed. Compression and procedural treatment work best together.

How much does venous insufficiency treatment cost in Singapore?

Costs vary by procedure. A duplex ultrasound scan typically costs SGD 150–300 at a private clinic. Sclerotherapy runs SGD 500–1,500 per session for spider veins, or SGD 2,000–5,000 per course for varicose veins. Ablative procedures (RFA, EVLA, VenaSeal) are SGD 5,000–8,000 per leg. Symptomatic varicose vein treatment is Medisave-claimable in Singapore under MOH withdrawal limits — confirm eligibility at the time of consultation.

When should I see a doctor for heavy legs in Singapore?

Seek review if leg heaviness is affecting daily activities, disrupting sleep, causing visible swelling that does not fully resolve overnight, or if the overlying skin is changing colour or texture. A vascular specialist at Paragon Medical Centre can assess your veins with a duplex ultrasound and advise on whether treatment is needed — and if so, give a clear timeline for how long results will take to appear.