The earlier the better. If you see someone is struggling to cope, you should suggest they reach out to community supports or professional help. Let them know that there are people they can talk to who can help (like a school counsellor, family doctor, or helpline), and that they don’t have to go through this alone.
By encouraging and supporting someone to get the help they need, we normalize help seeking behaviour. It’s like when that first brave student has the courage to stick their hand up in an auditorium of 1,200 first years and ask a question. From then on it’s just a little bit easier for everyone else to ask their questions. It’s like a destigmatizing snowball effect.