Unexplained Muscle Soreness

So last night my legs were a little sore. Today, my shoulders and back are a little sore. generally poor throughout the body. I have not done any exercise. I studied for the final non-stop. If all I have been sitting still for almost all week. I have no other symptoms. No runny nose. no fever. No excessive urination or blurred vision. Could it be a bacterial infection?

It could be just the stress of all that study, you've been inactive for a while and stretched over your muscles can cause headaches to get, try to speak up and doing some stretching, if it does not work then yes you can have an infection comes.