Postnasal drip occurs when excess mucus accumulates in the back of the throat. This can happen due to various reasons, such as allergies, colds, or sinus infections. The mucus can irritate the throat, leading to a persistent cough or the sensation of needing to clear the throat. Common symptoms of postnasal drip include a sore throat, cough, and nasal congestion. Treatment often involves addressing the underlying cause, such as using antihistamines for allergies or decongestants for sinus issues. Staying hydrated and using saline nasal sprays can also help alleviate symptoms.