What cause low immunoglobulin m?

Low immunoglobulin M (IgM) levels can be caused by various factors, including genetic disorders, certain infections, and autoimmune diseases. Conditions such as Common Variable Immunodeficiency (CVID) or Hyper-IgM syndrome can lead to impaired immune function and reduced IgM production. Additionally, certain medications, like immunosuppressants, and chronic diseases, such as liver or kidney disorders, may also contribute to low IgM levels. It's important to consult a healthcare professional for proper diagnosis and management.