Rhinitis medicamentosa is caused by-
**Core Concept**
Rhinitis medicamentosa is a condition characterized by rebound nasal congestion brought on by the extended use of certain medications, particularly topical nasal decongestants. This phenomenon is related to the **vasoconstrictor** effects of these drugs on the nasal mucosa. Prolonged use leads to a vicious cycle of dependence.
**Why the Correct Answer is Right**
The correct answer is related to the overuse of topical **decongestants**, which initially reduce swelling in the nasal passages but eventually lead to **rebound congestion**. This is because the nasal mucosa becomes dependent on the constant application of these **vasoconstrictors** to remain decongested.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because, while other factors can cause rhinitis, they are not specifically linked to medication overuse.
**Option B:** Incorrect as it is unrelated to the mechanism of rhinitis medicamentosa.
**Option C:** Incorrect because, although it might be a factor in other types of rhinitis, it's not directly related to the medication-induced type.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that rhinitis medicamentosa is a **reversible** condition if the offending medication is discontinued, allowing for the nasal mucosa to recover from the rebound effect.
**Correct Answer:** D. Topical decongestants.