Spider veins are small, visible blood vessels that sit just beneath the surface of your skin, forming thin red, blue, or purple lines that often branch out in patterns resembling a spider’s web or tree branches. They’re extremely common: in a study of over 1,500 adults in Scotland, 88% of women and 79% of men had spider veins in just one leg alone. Most appear between the ages of 30 and 50, though they can develop earlier.
How Spider Veins Differ From Varicose Veins
Spider veins and varicose veins are related conditions, but they look and feel quite different. Spider veins are flat or nearly flat against the skin. If you run your hand over them, you usually can’t feel them at all. They’re much more superficial, sitting in the uppermost layers of skin rather than deeper tissue.
Varicose veins, by contrast, look like lumps, bumps, or ropey nodules underneath the skin. They’re three-dimensional, often bulging visibly, and you can typically feel them with your fingers. Varicose veins involve larger blood vessels and are more likely to cause discomfort, while spider veins on their own are a cosmetic issue rather than a medical one.
Why Spider Veins Form
Spider veins develop when tiny blood vessels near the skin’s surface become dilated and visible. The underlying cause is usually a combination of weakened vessel walls and increased pressure in the veins. Several factors raise your risk.
Genetics plays a significant role. In one study, more than half of women with visible vein problems had a parent with the same issue. If your mother or father had spider veins, your chances of developing them go up substantially.
Hormones are another major factor. Estrogen can weaken the valves inside veins that normally keep blood flowing in one direction. This is one reason spider veins are more common in women than men. Using hormonal birth control or taking hormone therapy during menopause can further increase your risk.
Prolonged standing or sitting forces your leg veins to work harder against gravity, increasing pressure over time. Jobs that keep you on your feet for hours are a well-known contributor. Pregnancy also raises vein pressure due to increased blood volume and hormonal shifts, and spider veins that appear during pregnancy sometimes fade afterward but often don’t fully resolve.
Age, sun exposure (especially on the face), and obesity round out the list. As you get older, the walls of your blood vessels naturally lose some of their elasticity, making them more prone to dilation.
Do Spider Veins Cause Symptoms?
Spider veins themselves are harmless and typically don’t cause any physical symptoms. They won’t lead to blood clots or serious circulation problems on their own.
That said, it’s common to have spider veins alongside varicose veins or other underlying blood flow issues. When those coexist, you might notice burning, cramping, itching, pain, or a heavy, tired feeling in your legs, especially after standing for a while. The important distinction is that those symptoms come from the deeper vein problems, not the spider veins themselves. Treating the spider veins alone won’t relieve those symptoms.
How They’re Diagnosed
A doctor can usually identify spider veins with a simple visual examination. They’re distinctive enough that no special testing is needed to confirm what they are.
However, if your doctor suspects deeper vein problems, such as underlying venous insufficiency that could be feeding the spider veins or causing symptoms, they’ll likely order a duplex ultrasound. This is the gold standard for evaluating superficial venous disease. It maps out the anatomy of your veins and checks whether the valves inside them are functioning properly. The ultrasound helps determine whether treatment should target the spider veins alone or address a deeper issue first.
Treatment Options
Because spider veins are cosmetic, treatment is entirely optional. Most people seek treatment because they don’t like the way spider veins look rather than because of any medical need. Two approaches are most common.
Sclerotherapy
This is the most widely used treatment for spider veins on the legs. A provider injects a chemical solution directly into the affected veins using a very fine needle. The solution irritates the vessel lining, causing it to scar and close. Once the vein shuts down, your body gradually reabsorbs it, and the visible lines fade over weeks to months. Multiple sessions are typically needed to get the best results, but sclerotherapy allows a provider to treat many veins in a single appointment.
Laser Treatment
Surface laser treatment works by directing focused heat energy at the spider veins through the skin. The heat damages the vein wall, causing it to scar and eventually disappear, the same end result as sclerotherapy through a different mechanism. Laser treatment is often used for spider veins on the face, where injections are less practical. On the legs, it tends to be more uncomfortable and slower than sclerotherapy, meaning fewer veins can be treated per session and more appointments may be needed overall.
With either approach, treated veins don’t come back. But new spider veins can develop over time, especially if the underlying risk factors (genetics, hormones, prolonged standing) remain in play.
Reducing Your Risk
You can’t fully prevent spider veins if you’re genetically predisposed, but a few habits can slow their development. Regular movement throughout the day helps keep blood circulating rather than pooling in your leg veins. If your job requires long periods of standing or sitting, taking short walking breaks or shifting your weight frequently makes a difference. Elevating your legs when resting reduces venous pressure. Compression stockings, which apply gentle graduated pressure from the ankle upward, can also help support blood flow in the legs, particularly if you already have early signs of vein issues.
On the face, sun protection matters. UV exposure damages the small blood vessels near the skin’s surface and is a common trigger for facial spider veins, especially on the nose and cheeks. Maintaining a healthy weight reduces the overall pressure on your leg veins.