Condition	Comment
Causes of dry eyes
Allergic conjunctivitis	Burning eyes, mucoid secretion, and conjunctival erythema
Blepharitis	Eyelid margins are erythematous and thickened with crusts and debris within the lashes; usually worse in the morning and improves as the day goes on; does not respond to lubricant drops
Environment	Dryness caused by prolonged exposure to low humidity, dust, or sun
Lifestyle	Dryness caused by diminished blinking during long periods of reading, driving, or computer use
Medications	Diuretics and anticholinergic medications, including treatments for Parkinson disease, Alzheimer disease, depression, allergic rhinitis, and incontinence
Rosacea	Ocular symptoms (e.g., itchy, burning, dry eyes with eyelid swelling and erythema) occur in 50 percent of patients with rosacea
Causes of dry mouth
Diabetes	Dryness worsens with poor glycemic control
Head and neck radiation	External beam radiation damages salivary glands
Hepatitis C	Sialadenitis results in dry mouth in 15 percent of persons with hepatitis C
HIV infection	HIV-related salivary gland disease exhibits clinical manifestations similar to Sjögren syndrome
Medications	Diuretics and anticholinergic medications, including treatments for Parkinson disease, Alzheimer disease, depression, allergic rhinitis, and incontinence
Obstructed nasal passages	Dryness caused by mouth breathing
Sarcoidosis	Decreased salivary flow results from noncaseating granulomas in salivary glands