gas problem

A little grandmother went to the doctor and said:
- Doctor I have a little problem of gas but it does not bother me so much because they are neither loud nor fragrant ...
The doctor replies
- I see! Take these pills and come back next week.
The following week, she went back to the doctor and said:
- Doctor, I do not know what you gave me, but now my farts, although still silent, feel really bad!
- Well, replied the doctor, now that your sinuses have been cleaned, let us take care of your ears ...