One of the main symptoms of glossitis is a beefy red tongue. It results in an inflammation of the tongue that may be painless or it could cause some level of pain. Glossitis is typically caused by a lack of certain nutrients in the diet.
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A big cause of a beefy, sore, red tongue is a B-12 deficiency. B-12 deficiencies show up as a macrocytic anemia, usually without hemolysis. Autoimmune gastritis can cause this due to autoantibodies attacking the parietal cells in your stomach causing a decrease in intrinsic factor, which is needed to bind B-12 to get absorbed.