What Causes Nausea While Brushing Teeth?

Feeling nauseous while brushing teeth may result from improper brushing techniques or underlying conditions such as chronic pharyngitis or nasal disorders.

1. Improper Brushing Technique

Brushing incorrectly—such as using an oversized toothbrush, applying excessive force, brushing too rapidly (thereby irritating the tongue’s surface), or using toothpaste with a strong, irritating odor—can commonly trigger nausea during toothbrushing.

2. Chronic Pharyngitis

In patients with chronic pharyngitis, the pharyngeal reflex is typically heightened, and the pharyngeal mucosa is often congested, with dilated small blood vessels and increased secretions. Under these conditions, nausea during toothbrushing is relatively common.

3. Nasal Disorders

Nasal conditions—including rhinitis or sinusitis—may cause symptoms such as nausea and excessive nasal discharge. Additionally, oral and mucosal secretions are frequently present, making nausea during toothbrushing more likely.

If nausea occurs regularly while brushing teeth, it is advisable to seek prompt medical evaluation at a hospital. Treatment should be initiated under a physician’s guidance, based on diagnostic findings.