It can be hard to start a conversation with someone about their emotional wellbeing. However if you are worried about someone, try and get them to talk.
It can particularly hard to have personal conversations with colleagues, but you might feel comfortable trying. If not, perhaps your manager or HR colleagues could start a conversation with them. If you are genuinely worried about a colleague, don't just ignore it.
Talk to a professional
There are a range of great helplines that employ professional support staff who are trained to listen to those going through periods of trauma. You might not feel qualified to help, but these organisations are.
At work, encourage your employer to signpost external helplines around common areas. This will help challenge the stigma attached to reaching out for help.