Thread veins — often referred to as spider veins — are small, visible blood vessels that appear just beneath the surface of the skin, most commonly on the legs or face. They are usually purple, red, or blue in colour and form delicate, branch-like patterns resembling spider webs or tree branches. While thread veins are typically harmless from a medical perspective, they can affect self-confidence and lead people to wonder if they’re a sign of an underlying health issue. Understanding what thread veins are, what causes them, and when to consider further evaluation helps patients make informed decisions about their health