Why is my tongue swollen and sore on either side? I'm Dr. Manan Shah, I'm an ENT and allergist at Wyndly Health. When your tongue is swollen on either side, it's really frustrating and it can be due to a number of different issues. One of the most common causes is a vitamin deficiency. You can be missing B12 or folic acid and this can cause something called glossitis and that's when you get a sore, smooth, or irritated cracked tongue. It could also be due to aphthous ulcers. These are little whi

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