Selective IgA Deficiency is a common primary immunodeficiency disorder characterized by low levels of immunoglobulin A (IgA) in the blood. IgA is an antibody that plays a crucial role in mucosal immunity, helping to protect the body from infections, particularly in the respiratory and gastrointestinal tracts. Individuals with this condition may experience recurrent infections, allergies, and autoimmune issues, although some may remain asymptomatic. The exact cause of Selective IgA Deficiency is often unknown, but it can be associated with genetic factors. Diagnosis typically involves blood tests to measure antibody levels. While there is no specific treatment, management focuses on preventing infections and addressing any complications that arise.