Hello there! Yes that is a symptom but it isn't blockage. Are you drinking stright senna tea if you are then you need to move to maybe "smooth move" it's a bit lighter and not as harsh. Some people can't handle senna and if you are one of them then you need to move to something else. Shellycat posted something regarding this and how senna can be very harsh on your system and some people can't handle it. look back to previous posts and you will find it, it was just recently so you won't have to go back to far. I add ginger to my smooth move and that seems to help if I get any cramps at all it lightens them up alot. Hope this helps, Melanie