What causes tongue swelling?

Many things. Dr. Kwok's answer is thorough. Keep in mind tongue swelling *can* be a life threatening problem if severe. If you have severe swelling, feel like you are having trouble breathing, call 911 or head to the er. If you take an ace-inhibitor (lisinopril or other -pril medicine) make sure you get this checked out asap as those medicines can cause a very rare but serious allergic reaction.
A few possibilities. Tongue swelling, either part or all of the tongue, can be due to many causes, such as: allergic reactions (may be a 911 emergency), irritants (chewing on leaves containing crystals), infections (from piercings), trauma (bit tongue), enlarged lingual tonsils (tongues have tonsil-type tissue in the back portion), diseases that deposit substances inside the tongue, tumors, burns, etc...

Related Questions

What causes tongue swelling a year after it was pierced?

Possible infection. It may or may not be related to the piercing since it is now one year down the line. If it is related then it could be an infection which you should have checked out. Read more...
It depends. But the most likely problems are infection or a contact allergy to the stud. Read more...

What might cause tongue swelling at the time of menstruation each month? Not on any meds and have had allergy tests.

Consult an allergist. Tongue swelling can be a serious issue and the onset with menses is suggestive of a hormonal component . However it is only prudent for you to consult an allergist to get evaluated for other potential causes as well. Read more...

What is causing my tongue swelling?

Many possibilities. I would recommend seeing your doctor so that you can be tested for possible causes of angioedema. Read more...

I have severe tongue swelling both at home and when I'm away. No med changes in years. No food-related patterns. Always feel numbness 1st. Causes??

Angioedema. this can be critical. some antihypertensive medications can be associated it and some NSAIDs cause it too, I suggest you see an allergist for some blood work and if currently swollen, seek medical attention immediately. You need to have some test to check your type of angioedema, it is likely to be idiopathic. if the attacks are frequent, a daily antihistamine such as Zyrtec or Allegra (fexofenadine) help. Read more...

Cause and cure for gross tongue swelling? What are allergies cause it. I heard from a doctor that farmers used to get it?

Stop the cause. There are several causes but narrowing it down depends on whether it is acute and then goes away or whether it persists for days, weeks, or months. Acute: food allergy, ace-inhibitor medication, other medication reactions. Persistent: amyloidosis, cancer, acromegaly, nutritional problems. Usually, you would know if a food caused it because it would swell as soon as it touched the tongue. Read more...