I was told once you get a stone you are more prone to them. I haven’t had one in a long time (bonking on my head while saying knock on wood) but those things are a bear.
As long you know the blood is from a stone (evidently you can get blood from a stone) then it’s ok.
If you’re not sure it’s from a stone then that’s a bit scary.
My doctor says mine are mostly from dehydration and I cleaned up my diet and between those two things I haven’t had another one.