There are a number of possible causes of burning mouth syndrome, including:
- damage to nerves that control pain and taste
- hormonal changes
- dry mouth, which can be caused by many medicines and disorders such as Sjögren’s syndrome or diabetes
- nutritional deficiencies
- oral candidiasis, a fungal infection in the mouth
- acid reflux
- poorly-fitting dentures or allergies to denture materials
- anxiety and depression.
In some people, burning mouth syndrome may have more than one cause. But for many, the exact cause of their symptoms cannot be found.