Answer to Question 1
Xerostomia, or reduced saliva production, is a common side effect of head and neck radiation and chemotherapy (methotrexate, 5-fluorouracil, paclitaxel, carboplatin, cisplatin). Other causes of xerostomia include dehydration, chronic graft-versus-host disease of the GI tract, and certain medications (narcotic analgesics). The severity of xerostomia is correlated with the severity of oral discomfort, dysgeusia, dysphagia, and dysphonia. Drugs used to treat cancer can also thicken the saliva, causing the mouth to feel dry. Treatment of xerostomia may include use of artificial saliva (saliva substitutes) and/or mouth moisturizers.
Answer to Question 2
restrictive-malabsorptive, malabsorptive-restrictive