text: what would be the reason for severe sharp pains in the groin area? i am 16, and for the last 2 or 3 years, i have have had severe sharp pains in the groin area, and 12 day long periods. sometimes they are so horrible i have to lie in fetal position for hours at a time. the last 2 months my periods have been the same time & length but the blood is black, throughout the whole 12 days. can anyone help me at all? thank you.  <3 supergurl make an appointment with a ob/gyn asap!!! they can accurately diagnose this problem.   i had this many well over 25 yrs ago. cyst on my ovary. horrible pain!!!  gynecologist took care of it in no time flat.