I have had that pain..miserable! My doctor said it was the sciatic nerve that could be getting pinched. Lots of stretching and, for me, heat. It took a long time to ease up.
Hugs for you, Wanda

@A MySpondylitisTeam Member, same for me, it winds up being my sciatica nerve being inflamed. I've had it so bad that I couldn't have anything touching my back or bottom without having massive pain.

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A MySpond...

Hi..I have pain deep within the buttocks..that is usually sciatic working on me..I have to be very careful not to lift or bend down to much..Good luck my friend 🤗

Hi Alita,
I can't say I've felt it in my buttocks. I feel it near there more at the tailbone and the groin area seems to be the most intense, sitting or standing, doesn't matter. I have heard of some do have it there and activity may ease it some. What does your doctor say? If you haven't already, they see a quantity of these cases, maybe they'll be able to answer you with greater understanding.
Best to your answer and to your relief.
Lola

Yes. I have pain deep in lower buttocks almost daily. It’s another side effect of AS. It hurts. I sit on heating pad to help. I take prescription pain medication which helps. I don’t think I’d be able to survive the pain without pain meds.