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The tongue papillae, including the taste buds, can become inflamed. A sore tongue is not always a sign of something more serious. The tongue should be included in good dental health habits. Over time, smoking can make the tongue more sensitive to heat and cold.
If you are allergic to certain grass pollens, then melons, tomatoes, oranges and peaches may cause your tongue to feel sore and itchy. You can experience this same reaction with certain nuts and raw vegetables. This is not a complete list of pollen and fruit cross-reactivity.