Dry, itchy throats most commonly occur when the mucus membranes in the throat become dehydrated due to a variety of factors that include sleeping with an open mouth, low humidity in the home and decreased intake of fluids, explains Health Grades. The condition can also be caused by excessive coughing.
An itching, dry throat can also occur as a result of inflammation of the throat tissues due to cold viruses, according to Healthline. Post-nasal drip and continual exposure to hot environments may also lead to dryness and itching.
Itchy throat symptoms are sometimes triggered by allergic rhinitis, a condition in which the immune system reacts to allergens such as pollens and molds, explains MedlinePlus. Additional symptoms of allergic rhinitis include sneezing, watering eyes and an affected sense of smell. In certain cases, the condition can occur following ingestion of certain foods. Itching throat symptoms due to allergies are often remedied with antihistamine medications.
Dry throats are also a symptom of dry mouth, a condition that occurs when saliva production is hindered, explains WebMD. Dry mouth can be caused by a variety of factors that include medications utilized to treat depression or diarrhea, and medical conditions such as Parkinson's disease and diabetes. Cigarette smoke and chewing tobacco may also limit saliva production, leading to dry mouth.