The majority of blood donors are unpaid volunteers who donate blood for a community supply. Many donate for several reasons. Despite the many reasons people donate, there are not enough potential donors to keep up with the need. Donating is relatively safe, but some donors may have bruising where the needle is inserted or may feel faint.

Potential donors will be screened for things that might make their blood unsafe to use. This screening includes testing for diseases a blood transfusion can transmit. When donating blood, you must also answer questions about your medical history and take a sho...