Have you ever enjoyed time outdoors only to discover you’re the one covered in mosquito bites while everyone else escapes untouched? It may feel unfair, but mosquitoes aren’t acting at random. There’s real science behind why certain people attract them more.

Only female mosquitoes bite, and they do so to obtain the nutrients needed to produce eggs. Over time, they’ve developed an advanced ability to sense cues that lead them to ideal hosts. One of the strongest signals is carbon dioxide. People who release more CO₂—such as those who are taller, physically active, or have larger bodies—are easier for mosquitoes to detect, especially when body heat is involved.

Body scent also plays a major role. The bacteria living on our skin create distinct chemical signatures, and mosquitoes are drawn to specific combinations, regardless of personal hygiene. Blood type matters as well, with individuals who have type O blood tending to be bitten more frequently than those with type A.

Physical activity can further increase attraction. Sweat, lactic acid, and elevated body temperature act as powerful cues. Clothing color contributes too—dark colors like black or navy stand out more to mosquitoes, while lighter shades are less noticeable.

Other factors include lifestyle and biology. Alcohol intake, hormonal changes, perfumes, and scented products can all make someone more appealing. Genetics may be the most influential factor, explaining why mosquitoes consistently target certain individuals.

Although you can’t change your biology, you can lower your risk by using insect repellent, wearing light-colored clothing, limiting outdoor activity during peak mosquito hours, and removing standing water near your home.

So if mosquitoes seem to single you out, it isn’t bad luck—it’s your biology guiding their choice.