The clicking sounds is known as rales or a crakling sound. It can be due to bronchitis, pneunomia, pulmonary fibrosis, left sided congestive heart failure, pulmonary edema, and other things. It is best to get checked. Have you had a virus lately such as the flu or a bad cold? Some times you can get walking pneumonia after that or bronchitis.
It could also be your sinues dripping into your throat and chest. Do you have any other symptoms such as fever, pain, shortness of breath, coughing? If you have those, then I would see your doctor, but if not and you feel OK, maybe just take a decongestant and see if that helps.