[HAL]

I think an unhealthy INTP is one who has spent too much time as a recluse, not by choice, but because they don't realise how easily they slip into an easy routine. We're certainly ones for finding what is most comfortable for us, which is fine but can be detrimental to our ability to 'cope' with anything else.

I for one got into an awful study routine during my exam period. I wasn't spending time alone because I would study with a friend and often socialised with my flatmates, but it all became so routine that anything away from this pattern was quite a social shock to me. I had to meet the principle of the university and I was an utter bag of nerves, it was horrible. I know that in my more vibrant and varied days I can hand such social interactions with relative ease.

So yes, I think the most notable sign of an unhealthy INTP is extreme social anxiety, because they've forgotten what 'normal life' is like outside of their usual cycle.