A sore or white tongue isn't usually serious and is often easily treated. Most should only last a short time.
A pharmacist can look at your tongue and might be able to tell you:
Biting or burning your tongue with hot food or drink can cause pain and swelling. But this should last only a few days.
A white tongue can be a sign of a health condition.
Don't self-diagnose – see your GP if you're worried.
Read about lichen planus.
Read about leukoplakia.
Read about geographic tongue.
Read about mouth ulcers.
Read about oral thrush.