Have had a cough for four weeks now. any suggestions? nagging cough

More than a cold?: If some cough is just from a mild cold, then the over-the-counter cold medicines are what people usually find relief with. However, some illnesses such as asthma, allergies, strep throat and "the flu" also have these same cough symptoms, but can be treated by a doctor with additional medicines. A doctor's evaluation can be helpful, and determine whether the cough is one illness or sequential ones.