SS is the abbreviation of dry syndrome, which is a systemic chronic inflammatory autoimmune disease. Dry syndrome mainly invades the exocrine glands, among which the lacrimal and salivary glands are most commonly involved, often manifesting as obvious dry mouth, dry eyes, dental caries, and recurrent parotid enlargement. At the same time, other organs can also be involved, forming a variety of clinical manifestations, often involving the lungs, manifesting as cough, chest tightness and wheezing; involving the kidneys, causing renal tubular acidosis and hypokalemia. The onset of dry syndrome is mostly in middle-aged and elderly women, and the course of the disease is relatively long, and the prognosis is generally good.