It varies. The pain of kidney stones can vary and so can the pain of labour.
I've had both. I would say that the pain of the kidney stone was similar to the pain I had at the end of the first stage of labour when there was no break in the contractions and I could no longer cope with it by breathing through. This lasted about 10 minutes. From what I can remember, the pain was like a burning pain in the centre of my pelvis that radiated out to my hip bones as the contraction ended, like a smoke ring (I remember thinking of it like that at the time). I dealt with it by breathing through then relaxing as it got to my hipbones, and relaxing through the short break. When it got continuous I found it difficult to cope. I also wanted to throw up with each contraction. I had no pain relief because it was a short labour and the midwife was telling me the contractions would settle.
With my kidney stone, I had 6 1/2 hours of pain that started as discomfort and rapidly increased. It felt like being run through with a red hot poker, and I had no 'waves' like kidney stones are said have - it was continuous. I could not settle and had to keep moving to get comfortable, only to find I it made it worse - this seems to be characteristic of renal colic. By the time the OOH doctor arrived to give me something more effective than the diclofenac the GP had given me, I had given up and resorted to writhing and groaning a bit
. I also was very sick. I sort of hoped I would pass out but it never happened.
If I had had 6 hours of the labour pain, or back to back pain like a lot of women get, no doubt I would have been the same if not worse.
I would say my kidney stone was at the bad end of the scale (I should have been in hospital, especially with the vomiting) and they are worst first time. My labour was relatively easy on the grand scale, although I was left with some bad tears and PPH.
It is all relative, and different things anyway.
Your step day is obviously a bit jealous with all his competitive pain thing. He could try liver cancer, pancreatic cancer, or pancreatitis with multiple organ failure, if he wants something better
I have seen relatives go through all of these and not complain, but what they went through is unimaginable.