What are the risks of having O-negative blood?

People with O-negative blood are often called "universal donors" because their blood can be safely transfused to people with any blood type. However, there are some risks associated with having O-negative blood, including:

* Increased risk of developing immune system problems: People with O-negative blood are more likely to develop immune system problems, such as autoimmune diseases and allergies. This is because the immune system of people with O-negative blood is more likely to attack the body's own tissues.

* Increased risk of hemolytic transfusion reactions: Hemolytic transfusion reactions occur when the recipient of a blood transfusion develops antibodies against the donor's red blood cells. This can lead to the destruction of the recipient's red blood cells, which can be life-threatening. People with O-negative blood are more likely to develop hemolytic transfusion reactions because they have the most common blood type.

* Difficulty finding blood donors: People with O-negative blood are in high demand as blood donors, but they can sometimes be difficult to find. This is because only about 7% of the population has O-negative blood.

Overall, the risks of having O-negative blood are relatively small. However, it is important to be aware of these risks so that you can take steps to protect yourself. If you have O-negative blood, you should talk to your doctor about how to reduce your risk of developing immune system problems and hemolytic transfusion reactions.