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Cause
Examples
Drugs
Drugs with anticholinergic effects
Antianxiety drugs
Antidepressants
Antiemetics
Antihistamines
Antipsychotics
Antispasmodics
Recreational/illegal
Marijuana (cannabis)
Methamphetamines
Tobacco
Other
Antihypertensive drugs
Antiparkinsonian drugs
Bronchodilators
Chemotherapy drugs
Decongestants
Diuretics
Meperidine, methadone, and other opioids
Systemic disorders
―
Amyloidosis
HIV infection
Leprosy
Sarcoidosis
Sjögren syndrome
Tuberculosis
Daytime or nighttime mouth breathing
Head and neck trauma (causing nerve injury)
Dehydration
Radiation therapy to the head and neck area
Viral infections
