Have URI since 2/14, could sore throat move forward into mouth have sores on tongue? Small red sores on very back of tongue, kind of burn.

Oral infection. You may have strept throat or possibly a yeast infection especially if you have been on antibiotics.
Very likely. The chance that the bacteria that are in your sinuses will run down the back of your tongue and give you sores is very likely. You really could have diagnosed it yourself. These sore spots could also originate because you are sick. Other bad bacteria or viruses were just hanging out until they saw an opening. I encourage you let someone with a light and a tongue depressor diagnose it.

Related Questions

I have red sores in the back of my mouth is that usual when you have a sore throat? Is it possible as to why it's called a sore throat?

See below. Not all red areas in the back of the mouth are painful, but many are, thus the name - sore throat. Depending on what these areas look like can often help to determine if this is viral or bacterial like strep throat. Seeing your doctor can help to figure this out. Read more...

I have two small red dots flat under the skin in my mouth on inside the cheek other back top of my roof they don't hurt I also have a sore throat?

Red dots. This is impossible to diagnose without a visual examination and additional information. If they don't heal or disappear in 7-10 days, have them examined by your dentist or an oral surgeon. Read more...

My tongue burns, I have sores on the back of my mouth and I have a sore throat.

Fungus? You may have a fungal infection. Please see your doc so that it can be cleared up. It won't go away easily or quickly if that's what it is and you don't go to the doc. Peace and good health. Read more...
Sore throat. What you describe is rather common and can be due to many different conditions. One is herpangina caused by a coxsackie virus, but without being able to see the back of your tongue and throat would only be guessing. Why don't you see your family doctor and make sure this is not strep throat, or other illnesses for which would need more history to diagnose. Read more...