Dysgeusia: a disruption or disorder in the sense of taste. Symptoms of dysgeusia include a persistent metallic, rancid, foul, or salty taste in the mouth. There are a number of medications and conditions that can cause dysgeusia, including certain medications, cancer treatments, zinc deficiency, undiagnosed diabetes, poor oral hygiene, physiological changes like aging or pregnancy, and head injuries.
Larry Jameson, J. , Anthony S. Fauci, et al. Harrison's Principles of Internal Medicine, Twentieth Edition. 2018.