Bathroom smells like sewage after running kitchen sink


For the past few days the bathroom smells like sewage whenever the kitchen sink is ran for an extended period of time. The other faucets/shower/toilet don’t cause any odors. The kitchen is the farthest drain from the main sewer line. I don’t think it’s a p trap issue as it happens even if i just ran the bathroom faucet. I suppose it could be coming from the toilet wax seal but it’s strange that none of the other drains from the bathroom cause it, just the kitchen sink. I don’t know what to do but really would avoid paying a plumber at the moment. via /r/DIY

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