Rejection

Rejection is the process by which a person's body or immune system recognizes and responds to something it considers foreign or harmful—such as a transplanted organ, medication, or even tissue—and then acts to eliminate or suppress it. This is a natural safeguard to protect health, but it can also pose challenges in medical treatments like organ transplants, where the body's immune response might attack the new organ. Rejection can be managed with medications and medical strategies to help the body accept the foreign tissue or substance, improving the chances of successful treatment.