A mild itching or burning sensation on the tongue can sometimes be linked to a vitamin B deficiency, especially vitamin B12, but it can also occur due to other common causes like oral infections (such as Oral Thrush), allergies, dryness, acidity, or irritation from spicy foods or toothpaste. To find the exact cause, it is best to get a simple blood test to check vitamin levels and have your mouth examined by a doctor. If a deficiency is confirmed, vitamin B supplements and a balanced diet with foods like milk, eggs, and green vegetables can help. In the meantime, maintain good oral hygiene, stay well hydrated, and avoid irritants like very hot or spicy foods. If the symptom persists, worsens, or is associated with pain, white patches, or ulcers, you should seek medical advice for proper treatment.