The hay fever allergens may lead to the formation of too much mucus which can make the nose run or drip down the back of the throat, leading to “post-nasal drip.” It can lead to cough, sore throats, and husky voice. Although more common in older people and in dry inland climates, thick, dry mucus can also irritate the throat and be hard to clear.

Air conditioning, winter heating, and dehydration can aggravate the condition. Paradoxically, antihistamines will do so as well. Some newer antihistamines do not produce dryness.