In the UK when people ask "Are you alright" or "Are You okay", they're just saying 'Hello', and the required response is to say something like "Yes thanks, and you?" or simply to reply by saying 'Alright'. I was unaware of this for much of my adult life, and used to take it as a genuine expression of curiosity or concern about my wellbeing, and would often be taken aback by the question and say "What?" This in turn would lead to a certain amount of uneasiness and lack of mutual understanding all round.
I eventually worked all this out, and these days just give the required response. It occurs to me though that the situation in other cultures may differ from that of the UK, and that when someone asks if you're okay, they may be genuinely concerned about your wellbeing. That's sometimes the case here as well of course, but if so, they'll ask it in a very different tone of voice.
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On a mountain range
I'm Doctor Strange