Dry eyes are not necessarily dry syndrome, but dry syndrome is usually combined with dry eyes. Dry eye syndrome is mainly caused by the instability of tear film due to the low secretion or poor quality of eye tears, but it does not mean that the whole body mucous membrane will have dryness. However, dry eye syndrome is mainly an autoimmune disease, which will lead to dryness of the mucous membrane of the whole body, that is, not only dry eyes, but also dry mouth or dry hands, and some antibodies need to be tested, and if the antibodies are positive, there may be dry eye syndrome. Usually dry syndrome will include the manifestation of dry eyes, but the majority of people who have dry eyes do not have dry syndrome. However, if you have dry eyes or dry mouth or dry hands at the same time, you must exclude dry syndrome, otherwise the treatment of the disease may be delayed.