During different seasons of spring, summer and fall, trees, weeds, and grasses release tiny pollen grains into the air. This pollen can end up in your nose and throat and can trigger an allergy called hay fever.
Symptoms include the following:
- Coughing and postnasal drip
- Dark circles under the eyes
- Itching eyes, nose and throat
- Red and watery eyes
- Sneezing, often with a runny or clogged nose
Source: American Academy of Allergy Asthma & Immunology