Clinical perspective, offered as context rather than as advice. It helps to say which part of this you are uncertain about. A precise question gets a precise answer; a general one gets everybody’s favourite anecdote.
If somebody has the primary source to hand I would rather cite it than paraphrase it.
One concrete data point for the thread. One practical note: write down what you did and when, before you need it. Reconstructing a timeline from memory three months later is how people end up unable to answer the one question that would have resolved it.
Ask again with the specifics and you will get a better answer than this one.
A narrower follow-up, since the general answer is now clear:
How would you tell the difference between that and the alternative explanation?
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Shop Reference StandardsDr.PulmRoch said:One practical note: write down what you did and when, before you need it.
I am going to disagree with the direction of travel here. The thread has converged on the tidiest answer rather than the best-supported one, and those are not the same thing.