I've searched the forums and I haven't found anything on the topic I'm concerned about: Being extremely lightheaded while having a BM. It doesn't matter what kind of BM it is, I always get the same result. It's been happening for a few months now and I noticed that even if I'm not straining, I'll get extremely lightheaded and dizzy. It's usually right after the BM is released and a few times I thought I was going to just pass out on the toilet! Like I said, it doesn't matter if it's hard, soft, watery, a lot of poo, or just a little. It doesn't matter what time of day it is or where I am.. I always get very lightheaded during and after I use the bathroom. Does anyone else have this problem?