Someone was in my house this morning who sometimes uses the bathroom in a way that stinks up adjacent areas. not trying to be rude, that’s just what happens. today, right after they left, the smoke alarm went off briefly then stopped. this happened again a couple minutes later. I went upstairs (after confirming no fire) and smelled a horrific odor coming from the bathroom area. I assumed it was from them but was a little blown away by how bad it was. I opened the door to let it out, and the smell immediately wafted down the stairs. I closed the door again not wanting the house to smell bad and opened windows, putting a box fan in one. only then did I start to worry it could be a gas leak. Sometimes I get too paranoid, which is what I suspect may be happening here. The smell is still there, but it’s not downstairs. I’m using my phone, light switches, outlets, etc. with no problem. The odor is not coming from any appliances, I’m hearing no hissing sounds, and all water sources seem normal. But I’m just now extremely stressed that it could be a gas leak. What do you think? Im also afraid to do anything because in the very likely event that it’s nothing I don’t want to make a huge fuss over someone’s bathroom odor.

If you see this please give some advice, I’m just stressing right now and another humans thoughts would be helpful