How to Diagnose Odontogenic Sinusitis

Generally, odontogenic sinusitis can be diagnosed through methods such as observing symptoms, reviewing medical history, oral examination, sinus CT imaging, and nasal endoscopy. If you experience any discomfort, seek medical attention promptly.

1. Observation of Symptoms

Odontogenic sinusitis commonly presents with toothache—often pronounced and localized to the affected tooth, particularly in the molar region. Concurrently, typical sinusitis symptoms appear, including nasal obstruction (usually unilateral), resulting from inflammation confined predominantly to one sinus due to dental pathology. Purulent nasal discharge is also frequent and may be malodorous.

2. Review of Medical History

Evaluate whether the patient has a history of dental disease—for example, dental caries, periodontitis, or periapical inflammation. A prolonged history of dental abnormalities—especially involving teeth whose roots are anatomically adjacent to the sinuses—followed by the onset of sinus-related symptoms strongly suggests odontogenic sinusitis.

3. Oral Examination

Examine teeth for signs of decay, mobility, or gingival erythema and swelling, with particular attention to the maxillary posterior teeth. The presence of significant dental pathology—combined with inflammatory findings in the corresponding sinus region—provides an important diagnostic clue for odontogenic sinusitis.

4. Sinus CT Imaging

CT scans clearly reveal intrasinus pathological changes, such as mucosal thickening or fluid accumulation. In cases of odontogenic sinusitis, imaging may demonstrate a direct association between sinus and dental pathology—for instance, inflammatory extension from the periapical region into the sinus, or spatial proximity between sinus inflammation and root-related dental lesions.

5. Nasal Endoscopy

Nasal endoscopy allows direct visualization of the nasal cavity and sinus ostia. The presence of purulent secretions at the sinus ostium—particularly when correlated with concurrent dental pathology—supports a diagnosis of odontogenic sinusitis. Endoscopy also enables assessment of nasal mucosal inflammation, providing additional objective evidence for accurate diagnosis.

Maintain a light, bland diet; avoid spicy or irritating foods such as garlic, spicy hotpot, and mustard. Ensure adequate rest and avoid excessive fatigue to safeguard overall health.