Eosinophilic Granulomatosis With Polyangiitis (EGPA) is a rare autoimmune condition that causes inflammation of blood vessels, known as vasculitis. It primarily affects small to medium-sized vessels and is characterized by the presence of eosinophils, a type of white blood cell. Symptoms may include asthma, sinusitis, skin rashes, and kidney problems. The exact cause of EGPA is not fully understood, but it is associated with antineutrophil cytoplasmic antibodies (ANCA). Diagnosis typically involves blood tests, imaging studies, and sometimes a biopsy. Treatment often includes corticosteroids and immunosuppressive medications to reduce inflammation and manage symptoms.