Thanks for all these additional details.
Well, the most common cause with such symptoms are-
Having a little drop of blood, usually would not be of concern.
I understand that you had similar episode, two months back.
But if you are passing heavy blood with cough/ frequent episodes of blood in sputum, than it should be checked.
As a Physician, i would not be of concern.
Please be relaxed. And no need to get panic.
God bless you and take care.
Hope this helped
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