i also have this same feeling inside my left temple for about a month now. This feeling occurs whenever i am around smoke, when i am in school (the most stressful time of my day), and every night before i go to sleep. I just want to let a lot of you know that it is most likely not a tumor if you are not experiencing serious symptoms such as seizures, excessive vomiting or extreme blurriness in vision; however, you can never be sure until you see a doctor. I think this is most likely related to stress/anxiety. I recently went to the ER because i basically had a panic attack about this over night, and during this visit they gave me a CT scan and found nothing wrong. I've also recently taken an mri but have yet to get the results. I think it really has to do with stress, anxiety, and not getting enough sleep. I wish everyone here good health...god bless