Throat infections can cause due to seepage of excess secretions from back of the throat, as they can irritate and also get into larynx. Aspiration of secretions can result in upper and lower respiratory tract infections.
Cyst is a very non specific term, but if you mean by a swelling as a result of infection, yes it can cause cough. If the cyst is of long standing duration and increased in size recently, causing cough, swallowing difficulties, then it must be looked at. It may require excision biopsy. Please consult your ENT doctor immediately for the opinion and examination.
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