Person brushing her teeth in the bathroom

My gums bleed when I brush them. What causes this?

A common reason for bleeding gums is an incorrect brushing technique that leaves plaque on your teeth. This plaque makes the gums become inflamed and then bleed when brushed. Other factors that can make gums bleed include insufficient Vitamin C in your diet or hormonal fluctuations (especially during pregnancy for women). It can also be a sign of gum disease that, if left untreated, can lead to chronic gum infection and loose teeth.