Non-Celiac Gluten Senstitivity (NCGS), also referred to as gluten sensitivity (GS) or non-celiac wheat sensitivity (NCWS), is not well defined. It is not an immunoglobulin E (see the preceding Wheat Allergy section for more details), as with wheat allergy, nor autoimmune reaction, as with celiac disease. NCGS may have a congenital immune component, but this has not been firmly established. There are no tests or biomarkers to identify NCGS. Since NCGS is not well understood it is still not clear whether other components of gluten-containing grains may be involved in causing symptoms, at least in some cases. In order for gluten sensitivity to be diagnosed, it is first necessary to rule out CD, wheat allergy or other possible causes of symptoms. Then, if improvement is seen when following a gluten-free diet, gluten sensitivity may be diagnosed. Adherence to a gluten-free diet is the only treatment for NCGS at this time.