is just a symptom and not a disease in itself. It makes more sense to find out the cause of cough and then treat it. The causes vary from simple tonsillitis
to lung cancer
! Usually, dry coughs do not serve a purpose (of removing respiratory secretions) and therefore can be safely suppressed with a cough suppressant preparation. This is not the solution though.
If I have to give you an example; you ask medicine for fever
and doctor advises a tablet of crocin
. It will relieve the fever but will it cure you?? You have neither looked for the cause of fever nor did you treat it !