If this sign has appeared for a

Veins carry blood back to the heart.

They’re usually smooth and just under the skin, but thin skin, dehydration, or weight loss can make them stand out.

Sudden bulging or rope-like veins, however, may signal a health issue.

Varicose veins: Failed valves let blood pool, stretching veins.
Venous insufficiency: Poor circulation causes swelling, heaviness, or tingling.
Weight loss or dehydration: Quick fat loss exposes veins but should still be monitored.
Heart or liver disease: Rare but serious, may also cause fatigue, swelling, or skin changes.

Consult a doctor if veins bulge for more than a week or if you notice pain, swelling, redness, warmth, numbness, or rapid enlargement.

Stay active, hydrate, avoid long immobility, care for skin, and schedule checkups—especially with a family history of vascular issues.