4. Physical activity and sport
After exercise, we often notice that the veins become more prominent. This phenomenon, called “vascularization,” results from increased blood flow to the muscles. With regular training, especially weight training, the veins can remain more visible over the long term. Athletes and bodybuilders often have permanently visible veins, precisely because of low body fat and active blood circulation.
5. Hot weather.
Temperature also plays a role. In hot weather, the body dilates superficial veins to release heat and regulate temperature. This temporarily makes the veins more visible.
6. Hormonal changes:
Hormones affect blood circulation and tissues. During puberty or hormonal fluctuations, veins may appear more visible. This phenomenon is usually temporary and harmless.
When is the right time to see a doctor?
Visible veins on the arms are usually harmless, but you should see a specialist if you notice:
Swelling, pain, or redness in an arm or wrist: A possible sign of deep vein thrombosis (DVT), which requires emergency intervention.
Tender, hard, or inflamed veins near the surface—may be thrombophlebitis related to a blood clot, trauma, or infection.
Twisted and bulging veins with discomfort — although varicose veins are more common in the legs, they sometimes appear in the arms.
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