👉 Metapepsis in medicine is a condition where the body's immune system mistakenly attacks healthy cells, often leading to inflammation and tissue damage. This condition can occur when there are too many white blood cells in the bloodstream, which is called an overactive immune response. The body's immune system wrongly identifies these cells as foreign invaders and destroys them without their proper function or purpose. Metapepsis occurs more frequently in people with autoimmune disorders, such as lupus, rheumatoid arthritis, and