Wis tooth cavity. no tooth pain but burning nerve pain and mucosa sensitivity behind tooth where space is. no redness but painful to press. what is it?

An abscess: that is probably an abscess developed under the tooth usually from a chronic cavity that got to the nerve of that tooth , that in turn caused that abscess to develop under the tooth,you need to see a dentist ASAP , to diagnose and discuss treatment options wether by root canal treatment to the tooth after antibiotic treatment to clear infections,or by extracting that tooth also after antibiotics.

Wisdom tooth: It sounds like an infection, but it is impossible to know for sure without a clinical and visual exam, x-rays, and a dental history. Make an appointment with your dentist for an exam and diagnosis.

Impossible: Impossible to diagnose in this forum. You have to be seen, examined, X-rayed, palpated, probed, to be properly diagnosed and treated. Please see your Dentist NOW before the problem gets out of hand.

See your dentist: When wisdom teeth cause problems, they need to come out. If you are experiencing pain, swollen gums, lymph nodes and it does not go away or if you find it difficult to open your mouth, you should see a dentist for evaluation, x-ray and wisdom teeth removal.

Atypical Odontalgia: May be atypical odontalgia. Difficult problem. See TMJ-orofacial pain specialist if dentist finds no problem.

Wisdom tooth issue: What you describe could be an infection or abscess. What's really important is for you to see a dentist as soon as possible to determine both the cause of the pain and whether or not the tooth and gum problems can be treated or whether it's best to take out that wisdom tooth if the long term prognosis is poor or hopeless.