If you feel like mosquitoes always choose you over everyone else, you’re not imagining it. Research shows that mosquitoes are naturally more attracted to certain people due to a combination of biological and environmental factors.
One major reason is the carbon dioxide (CO₂) you exhale. People who breathe out more CO₂—such as taller individuals, pregnant women, or those who have recently exercised—are easier for mosquitoes to detect from a distance.
Your body odor also plays an important role. Sweat contains compounds like lactic acid, ammonia, and uric acid, and the unique mix of bacteria living on your skin creates a scent that can make you more appealing to mosquitoes.
Studies suggest that blood type may influence mosquito preference as well. Some evidence indicates that people with blood type O are bitten more often than those with types A or B, although this is not the only factor.
Body temperature matters too. Warm skin and increased blood flow—such as after physical activity or during pregnancy—can attract mosquitoes because they are drawn to heat.
The color of your clothing can also make a difference. Mosquitoes are more likely to notice people wearing dark colors like black, navy blue, or red than those wearing lighter shades.
While you can’t change your blood type or natural body chemistry, you can reduce mosquito bites by using insect repellent, wearing light-colored clothing, avoiding standing water around your home, and covering exposed skin, especially during dawn and dusk when many mosquito species are most active.
