Myths and facts about donating blood, and how it could reveal clues about your own health

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.

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