I am not sure what has happend, but I was crossing a stream by Whiterun and noticed I was taking damage each time I went in the water. I am using a number of mods, but not changed anything for a long time and never seen this before. Any ideas folks?

And you are sure there was no slaughterfish eating you?

Nope, this was a small stream, not open water.

OK, then there must be a mod that either has this feature or has bugged out.

It sounds like a mod that was trying to edit underwater breathing somehow and it broke?

post your load order.