It’s common to notice veins on your hands or legs becoming more visible over time, and in most cases, this is completely normal and not a cause for alarm. Veins lie close to the surface of the skin, and how obvious they appear depends on several factors, including your skin’s thickness, how much subcutaneous fat you have, your genetics, and your circulation.  As people age, their skin loses collagen and thins, making veins more noticeable.  In addition, those with lean builds or low body fat may have less tissue covering their veins, which makes them stand out more.

Everyday lifestyle factors can also play a big role in vein visibility. For example, exercise increases blood flow: during intense workouts or strength training, your muscles contract and press on your veins, causing them to dilate and become more pronounced. Heat and warm weather can likewise dilate veins in an effort to regulate body temperature, making them more apparent.  Other contributing factors include tight clothing (which can restrict blood flow), sun exposure (which breaks down collagen and thins the skin), and hormonal changes such as pregnancy or hormone therapy.

While more visible veins are often cosmetic or physiological in nature, they can sometimes signal an underlying vascular issue. One common concern is chronic venous insufficiency (CVI), which happens when the one‑way valves inside the veins weaken. That causes blood to pool in the legs, leading to symptoms like swelling, heaviness, skin discoloration, and even painful or aching legs. Varicose veins are another related issue: they are enlarged, twisted surface veins, usually in the legs, that may bulge visibly and feel uncomfortable.

Other more acute medical concerns include superficial thrombophlebitis (a clot in a vein close to the skin), which can cause redness and tenderness, and deep vein thrombosis (DVT), a more serious clot deep in a vein that requires urgent medical care.  These conditions are less common, but if prominent veins are accompanied by pain, warmth, swelling, or skin changes, they warrant evaluation. Also, a sudden change in vein appearance — without any obvious trigger like exercise or heat — could be a red flag.

If you’re wondering when to talk to a doctor, here are some scenarios to watch for: veins that suddenly appear or get worse, especially if they’re bulging or twisted; any pain, swelling, warmth, or skin discoloration near the veins; or a family history of vein disease.  Persistent heaviness in the legs, itchy skin, or leg ulcers are also signs that deeper vascular issues like CVI may be present.

To promote vein health and reduce the visibility of veins, several lifestyle measures can help. Staying hydrated, exercising regularly, and elevating your legs during rest can support good circulation. Avoiding long periods of sitting or standing also helps prevent blood pooling in your legs. (Verywell Health) If needed, medical treatments are available: compression stockings, sclerotherapy (injecting a solution into the vein), or laser therapies can address problematic veins.