Hello mam, As you have mentioned that you have undergone several radiographs and no underlying cause is diagnosed. So as far as your problem is concerned, i think that the pain(or pressure) which you experience may be due to hormonal changes in the body during that time. Gum tissue responds very quickly to the hormonal fluctuation. As a result, you may see symptoms appear in your mouth in accordance with your menstrual cycle. Yet it is not very commonly occuring problem but its existence can not be ignored. But usualy gingival tissue(gums) are affected (also known as menstruation Gingivitis) due to which you may also experience pain or pressure like feeling upon biting or chewing. So you should take preventive measures to avoid such problems. • Try to be even more diligent about brushing twice a day and flossing daily right before your period to keep your gums as clean as possible. • You can also apply gum paint over the gums twice daily. Hope this will help you Thank You Take Care Regards Dr Akash Abhinav