Dry mouth and dry eyes are just a symptom, not necessarily caused by disease factors.
Mild dry mouth and dry eyes may just be caused by lack of water in the body, while obvious dry mouth and dry eyes may be the manifestation of immune system diseases such as dry syndrome, toxic epidermolysis bullosa, systemic lupus erythematosus, rheumatoid arthritis and scleroderma, among which dry syndrome is the most common.
Dry syndrome is a chronic inflammatory autoimmune disease with systemic symptoms such as dry skin, fatigue, hypothermia, and wasting, in addition to dry eyes and dry mouth. Immunoserological examination can reveal positive antibodies such as anti-nuclear antibody, anti-DNA antibody, anti-ENA antibody, rheumatoid factor and many other antibodies.