 [ Symptoms ] what happens if one does not sign up for health insurance by december 23 [ Disease ] if you black out and hit your head on hard tile floor resulting in a concussion it would be possible to cause some brain damage this should be avoided of course and i would hate to see you going off to the toilet wearing a football helmet or a big pillow strapped to your head you may be passing out because of straining  creating a vasovagal response you can look this up on the internet there can be other reasons of course but this is the main one to research try to not strain during a bowel movement use a stool softener drink plenty of water and increase fiber in your diet so that you avoid being constipated dry hard stools take your time on the toilet read a good magazine do not hold your breath or tighten your neck muscles during defecation this is where the problem arises