Eh, I think you mean "balloon" (for cervical ripening) or induction? Honestly, from what my mum friends share, ada yang sakit, ada yang okay je, depends la on your body and how your cervix responds. One of them said the cramping was like period pain but stronger, another said it wasn't so bad. Best to ask your doctor or midwife what to expect and what pain relief options you have available, sebab everyone's experience is different! Are you close to your due date already?