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Losing body fat reduces the layer of tissue between veins and the skin.
As a result, veins may become more obvious even when circulation is completely normal.
This is especially common after significant weight loss or increased exercise.
## When Visible Veins Become More Concerning
A visible vein becomes more important when its appearance changes suddenly and is accompanied by symptoms.
Pay particular attention to the following situations.
## 5. A Vein Becomes Red, Warm, Tender, or Hard
A superficial vein that suddenly becomes:
* Painful
* Red
* Warm
* Swollen
* Firm or cord-like
may be inflamed.
This can happen with **superficial thrombophlebitis**, which involves inflammation and sometimes a small clot in a superficial vein.
It often affects the legs but can occur elsewhere.
Medical evaluation is advisable because symptoms can resemble other vascular conditions.
## 6. One Leg Suddenly Swells
