I ave been feelin a lump in my throat since yesterday, i used a flashlight to look in my mouth & behind my tongue i saw a square thing with vains. help?

See your doctor: It is best if you have your doctor look at the area and examine you to find out exactly what the problem is. Then you won't have to worry.

Get an exam: The only sure answer to this question involves you seeing a dentist for an evaluation. It may be normal anatomy or it may be evidence of a problem requiring treatment. If cost is a barrier, find a community health center in your area. Give serious consideration to stopping tobacco use as it can add significant risk to what may be growing in your mouth. Good luck !