Is non specific t wave abnormality a sign of pulmonary embolism diagnosed chest infection never had abnormal ecg before this ?

NSTW changes: Hi, I don't think it is, the ECG changes in Pulm Embolism are the sign of right heart strains and show itself in the right leads like v1-v4 and inferior leads II, III and aVF, and I don't see why a 24 yo otherwise healthy man should have PE if no risk factor presents.

Not a problem: Nonspecific T wave changes are common and often seen in normal people. They are not a sign of pulmonary embolism or anything else. Many normal people have nonspecific changes in their ECG from time to time. Often they come and go. None of this is abnormal.

Non-specific..: ... means exactly that, non-specific. The ECG is just one part of a clinical evaluation, and must be interpreted in the context of what is happening with the patient. Just the one piece of information is not diagnostic of anything, but is part of the evaluation that includes the patient's story, the physical exam, and clinical impression. Please follow up with your doctor to get answers.