Empath
"Empath" is a popular term for someone who feels other people's emotions intensely, often absorbing a room's mood as if it were their own. It is a descriptor people use for themselves, not a clinical diagnosis.
You walk into a tense room and your own chest tightens before anyone has said a word. A friend's bad day becomes your bad day. Many people who feel this way call themselves empaths, and the word captures something real about how porous the boundary between you and others can feel.
It is worth being plain: empath is a popular descriptor, not a recognized diagnosis. What it often points to is high sensitivity combined with a finely tuned habit of scanning other people's moods. For someone with a fawn response, that scanning was a survival skill, and reading the room early once kept you safe.
Feeling others deeply is not a problem to fix. The trouble is when their feelings flood out your own, so you can't tell what you want from what they need. The work is gentle: learn where you end and they begin, and let some of what you pick up belong to them.