Can someone develop an allergy to their own blood?

Rhys wasn’t her usual self. Typically, she thrived at her job, finding joy in coding for a successful tech startup. However, recently, she struggled to concentrate. Creative problem-solving, once her strength, now felt impossible. She couldn’t grasp the challenges, much less the solutions.

Overwhelmed by mental fatigue and a profound sense of exhaustion, Rhys snapped at her colleagues and friends. Hoping a gym session might help, she attempted a workout but could only manage a few repetitions before quitting. Returning home with a pounding headache, she collapsed on the couch, not planning to move for hours.

Her persistent headaches, irritability, weakness, and inability to focus weren’t temporary. Soon, Rhys received a challenging diagnosis: immune hemolytic anemia. In simple terms, Rhys was allergic to her own blood. This condition is one of several where the body mounts an allergic response to its own blood cells.

Typically, an allergy to one’s own blood arises from an overactive immune system. The body erroneously produces antibodies to attack the proteins, known as antigens, on the surface of red blood cells. This misguided immune response identifies healthy red blood cells as threats, leading to their premature destruction.

Under normal circumstances, red blood cells circulate for about 120 days before being filtered out by the spleen and liver. However, in Rhys' case, her red blood cells are destroyed too rapidly, triggering erratic emotional and physical symptoms. Beyond constant fatigue and irritability, Rhys experiences paleness, dizziness, and breathlessness as her anemia worsens. Fortunately, consistent medical care and steroid treatments have helped manage her condition.

Another disorder where individuals are essentially allergic to their own blood is immune thrombocytopenic purpura. Although its precise cause remains unclear, it involves antibodies targeting and destroying platelets in the bloodstream.

Platelets are crucial for blood clotting, with a healthy individual having over 150,000 platelets per microliter of blood. However, those with immune thrombocytopenic purpura often have fewer than 20,000 platelets per microliter due to constant destruction. This significantly raises the risk of severe bleeding. While there’s no cure, treatments like corticosteroids or spleen removal can help manage the condition [source: Mayo Clinic].

Although it may seem improbable, being allergic to your own blood is entirely possible. Thankfully, various treatments exist to alleviate symptoms, making these conditions more manageable.