I have the same problem. I went to a pulmonologist who also did sports medicine. He said it wasn’t that uncommon and, in my case at least, was due to hay fever and the phlegm plugging the lungs. He put me on an inhaled Steroid (FloVent) and it has made a huge improvement. I don’t know if there are any doping considerations. I don’t race anymore (age 63) but it makes breathing during regular riding much easier.
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