The symptoms of painful red tongue are caused by discomfort in general conditions, such as endocrine and metabolic disorders, and vitamin B deficiency. So, what are the causes of painful red tongue syndrome in patients? Here is a brief introduction: There are many possible factors that can cause painful red tongue. Systemic condition discomfort, such as endocrine, metabolic disorders, vitamin B deficiency and other reasons, especially menopausal women often complain of irregular tongue pain, accompanied by discomfort in other parts of the body. When patients suspect that they have a “tumor” in the pharynx, or in some cases when they see their own red, swollen and hypertrophic lobe papillae, contour papillae, fear, followed by discomfort or pain in the tongue, in order to carefully observe the condition and frequent tongue extension, mouth opening activities, so that the tongue root muscle fatigue, discomfort, thereby increasing the discomfort of the tongue. Mild tongue pain may also be caused by local stimulation, such as sharp tooth tips, unsuitable bracket substrates, etc.; or the weak current stimulation generated by two different metal restorations on the same side of the mouth, when the upper and lower jaws are opposite each other.