I know that anal fissures are supposed to spasm, but I've never really thought of mine behaving in that manner.
I can have very painful bowel movements, that are usually followed by extreme pain that lasts for 5 - 8 hours, and then drops to a mid-level pain for another 5 - 8 hours after that. The pain is a constant burn though, as if my bum hole is on fire, but if I put my finger up against the anal opening, I can just barely feel a pulse-like throb. To me, a spasm is something like a fist clenching, unclenching, clenching, unclenching, over and over again, but mine is one long, long, long stretch (hours upon hours) of searing pain. Another forum member likened his spasm to a leg cramp, but that to me, too, is not an on and off pain. When I've had a cramp in my calf, for instance, it seizes up and doesn't let go for even a second. There is no squeeze, relief, squeeze, relief, etc.
Could other members share their spasm experiences please?