Visible or bulging veins are common and usually harmless, but sometimes they signal health issues. Many factors make veins more noticeable, including “excessive exercise, aging, hot weather, tight clothing, genetics, sun exposure, and being overweight.”

Veins bulge when blood pools in weakened or damaged veins instead of flowing smoothly to the heart. This can lead to varicose veins — “swollen, twisted veins most often found in the legs but occasionally in the arms.” While often harmless, veins that show pain, swelling, or discoloration should be checked by a doctor.

Risk factors for varicose veins include “smoking, obesity, genetics, hormonal changes (especially during pregnancy), and long periods of standing or sitting,” according to the Cleveland Clinic. Treatments range from leg elevation and compression stockings to injection therapy or surgery in severe cases.

Untreated varicose veins can cause complications like venous ulcers — “slow-healing wounds near the ankles” — or increase the risk of blood clots, such as deep vein thrombosis or pulmonary embolism, which require urgent medical attention.

Prevention isn’t always possible, but risks can be reduced. Tips include regular exercise, maintaining a healthy weight, quitting smoking, and wearing loose clothing around the waist. By being proactive about circulation and vein health, you can minimize discomfort and prevent complications.