Asthma is a possibility. When you ride, do you have problems with wheezing or coughing? Do you feel like you can't inhale fully, like your lungs won't expand all the way?
A pulmonary function test would show if you have impaired lung function, which could be caused by asthma. They're quite effective -- the last one I took showed that my asthma was getting worse before I started to feel worsening symptoms.
- Gray 2010 carbon WSD road bike, Rivet Independence saddle
- Red hardtail 26" aluminum mountain bike, Bontrager Evoke WSD saddle
- Royal blue 2018 aluminum gravel bike, Rivet Pearl saddle
Gone but not forgotten:
- Silver 2003 aluminum road bike
- Two awesome worn out Juliana saddles