What does suspicious densities is seen in the right upper lobe and left mid lung means? is it seious or not? pls answer.

I assume: you are referring to a chest xray? "Suspicous densities" is not very specific, but it sounds like you have abnormal findings(e.g. mass,nodule,infiltrate,scarring) that might require further evaluation with a CT scan or other tests. Talk to your doc about what the results mean. No way to tell based on limited info how serious it might be. Take care.