Differential Diagnosis for Unilateral Watery Nasal Secretion
- Single most likely diagnosis
- Allergic rhinitis: This is often the most common cause of unilateral watery nasal secretion, especially if it's seasonal or triggered by specific allergens. The watery secretion is usually accompanied by other symptoms like sneezing, itching, and nasal congestion.
- Other Likely diagnoses
- Vasomotor rhinitis: This condition is characterized by an overactive nasal response to various stimuli, leading to watery nasal secretions. It can be unilateral and is often triggered by environmental factors.
- Anatomical abnormalities (e.g., deviated septum, nasal polyps): These can cause unilateral nasal obstruction and secretions due to the abnormal airflow and mucous accumulation.
- Infectious rhinitis (viral or bacterial): Although often bilateral, infectious rhinitis can present unilaterally, especially in the early stages or if one nasal passage is more affected than the other.
- Do Not Miss (ddxs that may not be likely, but would be deadly if missed.)
- Cerebrospinal fluid (CSF) leak: A rare but critical condition where there's a leakage of CSF through the nose, often presenting with clear, watery nasal secretions. This can be a sign of a skull base fracture or other serious conditions.
- Nasal tumor: Although rare, a tumor in the nasal cavity can cause unilateral nasal secretions and obstruction. Early detection is crucial for effective treatment.
- Rare diagnoses
- Gustatory rhinitis: A condition where eating certain foods triggers nasal secretions, which can be unilateral.
- Hormonal rhinitis: Changes in hormone levels, such as during pregnancy, can lead to nasal congestion and secretions, which might be unilateral in some cases.
- Atrophic rhinitis: A chronic condition characterized by atrophy of the nasal mucosa and turbinate bones, leading to foul-smelling, thick secretions, but can occasionally present with watery secretions.