How you say it affects whether it sounds concerned or confrontational. Gently asking, 'What’s your problem?' shows worry rather than aggression.
Pro Tip 2/3
Body Language
Non-verbal cues can change the phrase's meaning from caring to challenging. Raised eyebrows while saying 'What’s your problem?' can seem more inviting.
Pro Tip 3/3
Close Relationships
Use it with friends or family to show concern without seeming too invasive. Noticing a friend's mood, you might ask, 'Hey, what’s your problem?'