Thank you so much for your question. It is my privilege to be able to help you.
How long ago was the hysterectomy? When do you feel the cramps? Please tell me, I would love to help you with your problem. Dr. SaulJE
Thanks for the additional information. There are several possibilities, but since the surgery was three months ago, but is possible that you may have developed a hematoma (collection of blood) or an abscess (an infected collection of fluid) within your pelvis. This would explain your symptoms. The next step is for your doctor to order a CT scan of your pelvis to make sure there is nothing like this remaining inside.
Other possibilities include scar tissue formation, retained surgical instruments, but this (retained instruments, not scar tissue) should be found on a CT scan as well.
I hope this was helpful to you. If it was, please remember to ACCEPT the answer so i can get compensated for my work. if you have any more questions, please feel free to ask. i am truly privileged to help you, and i want to make sure that you are satisfied with your answer. Good luck! Dr. SaulJE