Etiology: lowered secretion rate/stasis, MOST common in PAROTID GLAND, damage from recurrent acute infection/childhood, (ductal ectasia, sialectasis, progressive acinar, destruction, w/lymphocytic infiltrate ((might be scarring over time!)), recurrent stones, changes in saliva chemically result. SSX: history of painful recurrent parotid enlargement aggrv by eating, >gland size, massage can produce scanty saliva at orifice, PERMANENT XEROSTOMIA (dry mouth) 80%. TX: treat the treatable (stone stricture, (same as acute-massage, lemon drops, abx). Bebe aggresive: periodic ductal dilation, ligation of the duct, total gland irradiation, excise the gland!