Myths and facts about donating blood, and how it could reveal clues about your own health
Updated on: September 9, 2026 / 11:32 AM EDT / CBS News
TL;DR
- The American Red Cross declared its second-ever national blood supply crisis due to a shortage that threatens patients.
- Women are more likely to be affected by a blood crisis because they tend to have lower hemoglobin levels and are more prone to anemia during pregnancy and childbirth.
- Blood donation includes a health screening that collects data on weight, blood pressure, and hemoglobin, which can be tracked by donors using the Red Cross app.
- Regular blood donation may offer health benefits, potentially improving blood pressure and heart health by temporarily lowering iron levels, though it does not prevent cancer.
- Myths such as being deferred due to tattoos (if from a regulated facility), not having a rare blood type, high blood pressure, or diabetes are generally false.
- Donors are advised to eat a hearty meal and stay hydrated before donating, and it is generally false that giving blood can make one anemic.