Does it mean you have an auto immune disease if had a positive ana test?

Not necessarily. A positive antinuclear antibody (ANA) test indicates the presence of autoantibodies, which are antibodies that mistakenly target the body's own tissues. While a positive ANA test can be associated with autoimmune diseases, such as lupus, rheumatoid arthritis, and Sjögren's syndrome, it is important to note that a positive ANA test alone does not definitively diagnose an autoimmune disease. Further testing and evaluation are typically needed to determine the underlying cause of the positive ANA result and whether an autoimmune disease is present.