Hi welcome to the health care magic Dry cough since six moth not normal... Following are causes.... -whopping cough -allergy cough -Cardiac causes -tuberculosis -lung problem including tumour also -viral flu like influenza Your work up done as follow -Chest x ray -Auscultation -sputum culture and throat swab -CBC If it is only allergic cough than antihistaminic drug or fexofenedine prescribed If x ray show any consolidation or mass than further work up needed Acid reflux and smoking habit can lead constant dry cough Consult pulmonologoist for examination with keeping all this in mind Hope your query solved Take care Good luck