Hi Welcome to HCM I have gone thru your query regarding lowering of WBC . It is not a matter of concern if WBC is low while suffering fom viral or infection at the time of blood check up . Reoccurring cough periodically may be the cause . You should get treatment for that and get check up again for your WBC . You have not mentioned your WBC count ? .Normal white blood cell counts range from 4,500 to 11,000 . After your treatment from a specialist for your cough , you get wbc checked It should be normal . I meanwhile , would suggest you to , strengthen your imune system which gives resistance against diseases ,by modifying your life style and food habits by taking diet full of essential nutrients , and supplements - ginger , garlic ,turmeric, lemon ,bitter gourd , nuts all antioxidants and proper exercise , walk ,yoga .pranayam ,deep breathing and meditation Avoid Fried ,fast foods ,Tea , coffee , alcohol ,smoking , mental stress ,worry Constipation . Above regimen will give you strong immune sustend assure you happy healthy Disease free life ahead . . . Hope this helps in solving your query .Wish you all the best Don t hesitate for further query if any .