Why does oral cancer cause bad breath?

The main reasons why oral cancer may cause bad breath are as follows: 1. Infection and inflammation: Oral cancer may lead to decreased immunity in the mouth, allowing increased bacterial growth, which in turn causes inflammation and infection. These bacteria and inflammatory products are the main sources of oral malodor. 2. Necrotic tissue: As oral cancer progresses, some cancerous tissues may become necrotic. The decomposition of these necrotic tissues within the mouth can produce foul odors. 3. Gastrointestinal dysfunction: In advanced stages of oral cancer, gastrointestinal metastasis may occur, leading to dysfunction of the stomach and spleen. This can result in food retention and indigestion within the stomach, which may also cause oral malodor. 4. Poor oral hygiene: Patients with oral cancer may experience pain or undergo treatments that affect their ability to maintain proper oral hygiene. Food debris remaining in the mouth can further exacerbate bad breath. If you have any concerns, please consult a relevant healthcare professional.