Human has provided you with an excellent answer and my only additional advice to you would be to get an assessment if you are remotely symptomatic.
As mentioned, symptoms typically include light headedness, dizziness, chest pain or breathlessness. That said, if you are very active and sporty, this might be "normal" for you.
If you are concerned, seeing a Physician or GP might be a good starting point, and they can take a more in depth history/clinical assessment, obtain basic investigations and then refer onwards if necessary.
I hope this helps.
BW
Dr Dinesh
