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Why would a tongue swell up?

My tongue is swollen. I'm 19 and it's just felt really felt fat for more than a week. I can feel it touching the back of my throat, which scares me like I won't be able to breathe. What should I do?
A swelling tongue can be a very distressing symptom that should be evaluated by a doctor right away. Depending on its severity and your ability to breath without problems, you should either go to the emergency room (if you are having trouble breathing) or see your doctor as soon as possible (if your breathing is fine). The best type of doctor to see for this is a primary care physician such as a family doctor. A swollen tongue can have a few different causes. The most severe and life threatening is a condition called angioedema. This is where fluid leaks into the tissues causing swelling. Symptoms besides a swollen tongue include swelling in the hands, arms, legs, face, and throat. All though I can not be sure, it seems that your description of feeling "fat" may be consistent with the. Causes of angioedema include severe allergic reactions and side effects of medications. It is usually very fast and thus, your description of it going on for a week is not typical. Other causes of a swollen tongue include vitamin B 12 or folic acid deficiency. These would be very unusual in someone your age unless you were a strict vegan. I suggest you get seen by a doctor soon. After a good history and physical exam, your doctor will be able to tell why your tongue is swollen.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under Zocdoc’s Terms of Service.

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