Because it sounds bad. 
A bladder prolapse or something? I was told I had one during my six week check but the doc didn't say much about it except to do my kegals. Now I've googled it and I feel crap. My body's gone through so much with this pregnancy and birth... I don't have any symptoms as far as I am aware. Anyone fancy telling me it's not so bad? Bit irritated that my doc didn't explain it properly. Maybe it's just post-chrimbo blues but it's really got me down...