Seeing people make so many terrible decisions. Again and again. Be victims of crime & be victims of the terrible situation they came out of thus they did the crime.
Not medical, but I deal with lots of people who struggle in that way. I hear their dreadful histories, the abuse, the breakdowns, the violent relationships, the addiction, the children taken into care. It's hard sometimes to keep professional boundaries without losing empathy.
I'm lucky, because I work in a very supportive environment, our managers are great, we look after one another within the team, when a challenging client brings a worker close to the end of their tether a new worker might be allocated, there's plenty of opportunity to vent and supportive debriefing after any incidents. But I've been doing this for 11 years and I'm glad I'm only 3 years from retirement.
It's getting harder and harder out there for people with poor coping skills, and the agencies that can help are losing resources at precisely the time when the service they provide is needed more than ever. But then I look at the good outcomes: the woman who'd been sleeping in her car for 2 months following a relationship breakdown and losing her live-in job, now rehoused in a lovely flat, the family with a young mum with severe MH problems whose eviction has been prevented, getting a young family rehoused after their mother suffered a devastating stroke at the age of 31 - and the satisfaction of knowing that we've made a positive contribution to those lives makes the rest of it worthwhile.
Oh, and black humour, chocolate and lots and lots of tea.