But there’s probably a good reason you have that cough — and it can tell you a lot about what’s going on in your body.

I suffered extensive fatigue that I had attributed to a COVID-19 infection. Then a lung culture found something called mycobacterium avium complex. Would you kindly consider discussing this?

The patient’s own doctors couldn’t agree on a cause. One said asthma. Another implicated her age, then 71. A third blamed ...