I have very mild cough for five weeks. I do not have any other symptoms. No weakness, no weight loss, no pain anywhere..no tiredness or dizziness.. however, cough occurs two to three times a day. It is not wet not dry. Especially it occurs in morning and evening. It does not interfere with sleep or any other activities. Is it indicating cancer? I read in google that persisting cough can be cancer. I am little worried.