I've started running again after a 4 month period of inactivity due to bronchitis. Used to be a sporty guy up to five years ago (I'm 35 now) then almost nothing until last year. Last year everything was fine while I was running in the gym.
Now I've been training again for about a month, slowly building up my mileage. Now I can do 6km in 35 min but towards the end of my run when my heart-rate naturally goes up and I also start running a little faster I noticed that I get a mild but constant chest pain so I slow down and then I'm fine. As soon as I drop below 160 bpm I'm fine again. Is this something you think I should have checked?