What should I check when I keep smelling odors with no clear source?

I’d start with the room, rather than trying to read a meaning into the smell. Check bedding, clothes, the mattress, nearby bins, vents, drains, and any spots where a pet or pest could have been. Ask someone else to check too, since smells can be hard to locate. If you smell rotten eggs or suspect a gas leak, leave the area and contact the gas utility or emergency services. Carbon monoxide has no smell, so make sure you have working detectors as well.

If other people can’t smell it and you keep noticing it in different places, bring it up with a doctor or an ear, nose, and throat clinician. A phantom smell can have several causes, including nasal or sinus issues, migraine, medication effects, or other medical problems, so the smell by itself doesn’t point to one diagnosis. Seek urgent care if it comes with sudden confusion, weakness, trouble speaking, a severe new headache, or seizure-like symptoms.

A strange smell isn’t reliable evidence of witchcraft or anything paranormal. That doesn’t mean the experience isn’t real, just that there are ordinary environmental and health explanations worth checking first. If it’s making you anxious, keep a simple note of when it happens and what’s nearby, and ask someone you trust to help check the space.