Can you fly if you have pericarditis?

Depends: Are you talking about an active inflammation, on medications, fluid around the heart, any symptoms? It all depends on how severe is the pericarditis. Probably don't fly if symptomatic. Commercial flights are pressurized to about 6000ft altitude of denver, co. That may or may not cause symptoms.

It should be: Fine depending on your current level of comfort.

Yes: Assuming that you mean in an airplane, (jk) whether you can fly depends on whether the pericarditis is stable. If you had developed a large pericardial effusion, (fluid around the heart) for instance, you might not be stable to fly or even to leave a hospital. But if you just have benign pericarditis with a little chest pain, you could be stable.

As passenger: Preferably after diagnosis, and treatment.