Our expert says:
It could be exercise induced asthma (or asthma), or it might be related to the fact that you're just starting out, and so your lungs are not used to the high and deep breathing rates. With time, you'd be able to figure this out, because fitness improves while asthma would remain.
I'd back off the intensity for a bit, see how you go at slower paces and then build up. If the problem persists, then it's worth seeing someone about it. Asthma is one possibility, there are some others, more serious, in that chest pain (which is a step up from tightness) can be a symptom of a heart issue.
So if it persists, definitely worth seeing someone.
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