Nutrient Deficiencies
Another common cause of tongue soreness is vitamin B12 deficiency, according to Cleveland Clinic. This nutrient supports neurological function and helps your body produce red blood cells.
Low vitamin B12 levels can lead to mouth ulcers, vision problems, depression, and irritability. Another symptom is glossitis, a condition that causes a sore, red tongue, notes the National Health Service (NHS). Tenderness and swelling of the tongue are common, too.
Glossitis can also be a symptom of iron deficiency, according to the NHS, especially if it occurs with other symptoms like fatigue, shortness of breath, heart palpitations, and pale skin.
Although these symptoms are not related to fruit consumption, some fruits, especially those that are acidic, may worsen tongue pain.
Blood tests from your doctor can determine if you have a vitamin deficiency. Getting more B12 through foods like meat, dairy, and fish, and more iron through meats, legumes, and leafy greens, as well as supplementation, treats these nutrient deficiencies.
In the meantime, to help with a sore tongue, eliminate tart, acidic, and salty foods from your diet for a week or so. Tomatoes, fruit juices, and citrus fruits are highly acidic, so cut them out and see how your body reacts. If your symptoms persist, consult a health provider to determine the cause and receive treatment.
