Excerpt from Bathroom Smells Like Sewer – How to Get Rid of the Smell:
The first thing that you have to do to deal with this issue of bathroom smells like sewer is to figure out the causes. Basically, the causes are varying. It can even involve more than just one cause. So, you really have to dig to find out where this lingering odor comes from. For instance, it may be caused by the broken drainage or sewage. Somehow, the pipe beneath your bathroom doesn’t seem to work properly. With the dirt and waste built up, the bad odor starts to develop. Or, it can also involve broken or damaged toilet sewage. It doesn’t matter what the cause is, it requires you to respond immediately. Prolonged exposure to bad sewer odor causes bad side effects like dizziness, nausea, explosion and also hydrogen sulfide poisoning.