Varicose veins can cause a range of side effects beyond their visible, bulging appearance. Some people with varicose veins experience no symptoms at all, while others deal with daily discomfort, skin changes, and, in advanced cases, open wounds on the legs. The side effects tend to worsen over time: in a long-term study following patients from the Edinburgh Vein Study, roughly one third of people with varicose veins eventually developed more serious skin changes associated with chronic venous insufficiency.
Pain, Heaviness, and Daily Discomfort
The most common side effects are sensations you feel rather than see. Aching and a heavy feeling in the legs are typical, especially after long periods of standing or sitting. Many people also report burning, throbbing, and swelling in the lower legs that gets worse as the day goes on.
Muscle cramps are another frequent complaint, particularly at night. A study comparing people with varicose veins to the general population found that 67% of those with varicose veins experienced muscle cramps in the prior year, compared to 53% of people without them. Calf cramps were especially common (91% vs. 75%), and they were far more likely to strike at night: 78% of varicose vein patients reported nighttime cramps, compared to 52% of the general population. If you’ve noticed your legs cramping more at night, your varicose veins may be contributing.
Swelling in the Lower Legs
Varicose veins develop when the one-way valves inside your leg veins stop working properly. Blood that should flow back up toward the heart pools in the veins instead, raising pressure in the surrounding tissue. That elevated pressure forces fluid out of the blood vessels and into the tissue around your ankles and lower legs, causing visible swelling. This swelling tends to be worst at the end of the day and may improve overnight when you’re lying down. Over time, the swelling can become persistent.
Skin Changes Around the Ankles
One of the more noticeable side effects is a gradual change in the skin on your lower legs, particularly around the inner ankle. This condition, called stasis dermatitis, is a direct result of the elevated pressure in your veins. When pressure stays high, red blood cells leak out of tiny blood vessels into the surrounding skin. As those cells break down, they release iron, which gets stored in the tissue as a brownish pigment. That’s why many people with long-standing varicose veins develop brown or rust-colored speckles near their ankles.
Beyond discoloration, the skin can become dry, flaky, and intensely itchy. Scratching worsens the problem, eventually causing the skin to thicken. In more acute flares, you might see redness, blistering, or weeping patches that can be mistaken for an infection. These skin changes aren’t just cosmetic. They signal that the underlying venous pressure is causing real tissue damage, and they mark a step toward more serious complications.
Tissue Hardening and the “Inverted Bottle” Shape
If venous pressure goes unchecked for years, the fat and connective tissue beneath the skin can become inflamed and gradually harden. This process produces firm, woody-feeling skin on the lower leg. In its early stages, it can appear as a painful, red, swollen area that looks a lot like a skin infection. In its chronic form, the hardened tissue narrows the lower leg while the areas above and below remain swollen, creating a distinctive shape that doctors describe as an “inverted champagne bottle.”
This hardening is a sign of advanced venous disease. The skin at this stage is fragile and prone to breaking down, which sets the stage for the most serious complication of varicose veins.
Venous Ulcers
The most severe skin-related side effect is the formation of open sores, typically on the inner leg just above the ankle bone. These venous ulcers develop when months or years of elevated pressure, inflammation, and tissue damage finally cause the skin to break down. They tend to have well-defined borders and can be slow to heal, sometimes lasting weeks or months.
Venous disease follows a recognized progression. At the mild end, you have visible veins and minor swelling. At the severe end, you have active ulcers. The Edinburgh Vein Study found that progression through these stages occurred at a rate of about 4.3% per year, with the likelihood increasing consistently with age. Not everyone with varicose veins will reach the ulcer stage, but ignoring worsening symptoms increases the risk.
Blood Clots
Varicose veins can develop small, painful blood clots in the veins just beneath the skin surface. When this happens, the vein feels hard and tender to the touch, and the skin over it may turn red and warm. This type of superficial clot is uncomfortable but generally not dangerous on its own.
More concerning is the link between varicose veins and deeper blood clots. A large Taiwanese study following over 425,000 adults found that people with varicose veins had a significantly higher rate of deep vein thrombosis (DVT) compared to those without. The DVT rate was about 6.55 per 1,000 person-years in the varicose vein group versus 1.23 per 1,000 person-years in the control group. People with varicose veins also had a modestly elevated risk of blood clots reaching the lungs, though the connection was less clear-cut after accounting for other health factors. If you notice sudden, severe swelling in one leg, warmth, or deep pain, those warrant prompt medical attention.
Bleeding
Varicose veins that sit close to the skin surface can occasionally bleed, sometimes from a minor bump and sometimes spontaneously. The risk is highest when the skin overlying the vein has become thin and fragile, or when small, blister-like pouches form on the vein wall. Because these veins are under higher-than-normal pressure, even a small nick can produce a surprising amount of blood.
If a varicose vein starts bleeding, the immediate steps are to lie down, elevate the leg above heart level, and apply firm pressure to the site with a clean cloth or pad. Keep the pressure on and don’t remove the bandage. For most people this stops the bleeding, but medical review afterward is important. Elderly people who live alone and those taking blood-thinning medications are at the highest risk of serious blood loss from a varicose vein bleed.
How Quickly Side Effects Develop
Varicose veins are not a static condition. They tend to progress, though the speed varies widely from person to person. In the Edinburgh Vein Study, nearly 58% of participants showed some degree of disease progression over the follow-up period, translating to roughly 4.3% annually. Age is the strongest predictor of how fast things move: older adults progress more quickly.
Early side effects like aching, heaviness, and mild swelling can remain stable for years. But once skin changes appear, particularly discoloration and itching around the ankles, the risk of moving toward tissue hardening and ulceration rises. Addressing varicose veins earlier in this timeline generally means simpler treatment and better outcomes than waiting until complications develop.