Other colors your tongue might be and what they could indicate are listed below. Red. A crimson (rather than dark pink) tongue might suggest a simple B vitamin deficiency, which can be corrected with treatment. Scarlet fever, eczema, and Kawasaki illness are among conditions that can cause your tongue to turn red. If you have any of these problems, contact your doctor immediately. Green. A healthy green tongue indicates that you're getting enough nutrients, including vitamins and minerals, through your diet. However, if your tongue is pale green or white, it may be due to medications or illnesses such as AIDS that can affect the immune system. Noticing any changes in the color or texture of your tongue should always be discussed with your dentist or physician. Yellow. If your tongue is yellow or white, it could be a sign of acid reflux disease, diabetes, or oral cancer. Make sure to visit your doctor for diagnosis and treatment of any health issues related to your tongue. Black. If your tongue is black, this could be an indication of alcohol abuse. It could also be caused by medications you take every day. If this is the case, make sure to talk to your doctor about changing your medication regimen. Blue. If your tongue is blue, this could be an indication of an electrolyte imbalance. You should seek medical help if you experience any changes in your mood or behavior associated with this condition.