Learn what different shades of blood mean and how they signal changes in your health or potential medical issues.

The color of a person’s period blood can indicate different health conditions. For example, a bright red period indicates a healthy flow, while darker red or dark brown can signify pregnancy.

Scientists have discovered how aging blood stem cells acquire mutations that give them a growth edge, creating fertile ground for the development of clonol hematopoiesis, a condition that dramatically ...