Explaining Everything on Instagram: "Blown veins happen when a vein gets damaged and blood leaks into the surrounding tissue instead of staying inside the vein. This often occurs during injections, blood draws, or IV placements when the needle goes through or out of the vein. The area may swell, turn blue or purple, and feel sore or tender. Older adults are more prone because veins become thinner and weaker with age. Dehydration can also make veins fragile and harder to access. Using too much pr