Question: what are the causes of constant sore throat?
Answer: Allergies. Allergies to pet dander, molds, dust and pollen can cause a sore throat. ... 
Dryness. Dry indoor air can make your throat feel rough and scratchy. ... 
Irritants. ... 
Muscle strain. ... 
Gastroesophageal reflux disease (GERD). ... 
HIV infection. ... 
Tumors.