The information provided here is not a replacement for a doctor. You shouldn't use it for the purpose of self-diagnosing or self-medicating but rather so you can have a more informed discussion with a professional TCM practitioner.
Mouth sores can be the consequence of several so-called “patterns of disharmony” in Chinese Medicine.
Chinese Medicine sees the body as a system, not a sum of isolated parts. A "pattern" is when the system's harmony is disrupted, leading to symptoms or signs that something is wrong (like mouth sores here). It is similar to the concept of disease in Western Medicine but not quite: a Western disease can often be explained by several Chinese patterns and vice-versa.
A pattern often manifests itself in a combination of symptoms that, at first glance, do not seem necessarily related to each others. For instance here mouth sores is often associated with irritability, palpitations with anxiety and fatigue in the pattern “Yin and Blood Deficiency”.
Once identified, patterns are treated using medicinal herbs, acupuncture, and other therapies. In the case of mouth sores we’ve identified that a herbal formula called Tian Wang Bu Xin Dan can help treat the patterns behind the symptom.
In Chinese Medicine mouth sores is a symptom for the pattern "Yin and Blood Deficiency". Below is a small explanation for it with links for more details.
Pulse type(s): Rapid (Shu), Fine (Xi)
Tongue coating: Partial absence of coating
Tongue color: Red
Yin and Blood Deficiency is often treated with Tian Wang Bu Xin Dan, a herbal formula made of 14 herbs (including Unprepared Rehmannia - Di Huang - as a key herb). Tian Wang Bu Xin Dan belongs to the category of "formulas that nourish the heart and calm the mind", which might be why it is often recommended for this pattern. Its main action as a formula is: "Nutritive tonic: Nourishes Yin, Blood and Vital Essence of the Heart and Kidney".
Source date: 16th century
Number of ingredients: 14 herbs
Key actions: Nutritive tonic: Nourishes Yin, Blood and Vital Essence of the Heart and Kidney. Clears away pathogenic Heat, clears Deficient Heat. Sedative.
Because it is a formula often recommended to treat the pattern 'Yin and Blood Deficiency' of which mouth sores is a symptom.
Its main actions are: Expels Heat by Cooling Blood. Tonifies Yin by promoting Fluid production. Soothes the Heart by calming Blazing Fire. Cools and nourishes.