What are possible causes of unilateral rhinitis?

Unilateral rhinitis, which is characterized by inflammation of the nasal mucosa affecting only one side, can indeed be caused by a foreign body or a nasal polyp. When a foreign object is lodged in one nostril, it can lead to localized swelling and discharge because the body reacts to the foreign material. Similarly, nasal polyps, which are benign growths that can develop in the nasal passages due to chronic inflammation, may also lead to unilateral symptoms if they are preferentially located on one side.

Both of these conditions can cause obstruction and irritation on the affected side, leading to symptoms that may mimic rhinitis, such as nasal discharge, congestion, and discomfort. The significance of addressing both foreign bodies and nasal polyps lies in the potential for complications, such as secondary infections or further obstruction, which can exacerbate symptoms and cause discomfort.

Other causes like allergies or colds typically present bilaterally, affecting both sides of the nasal passages. Similarly, nasal fractures and sinus infections can also present with bilateral symptoms. While these could theoretically contribute to unilateral symptoms in some cases, their primary manifestations are usually across both nostrils.