Treatment for Cough. Pls do let me know)

Hi, I have had a little bit of cough from a very long time...I mean I don't literally cough...but I have the sputum...and I feel there is nothing that completely cures it from its root....l always feel like I can still produce sputum from my throat no matter what I do.... And Whenever I eat anything spicy it exacerbates for a very transient amount of time but after I gargle or rinse it goes away and becomes normal... . . The colour is normal...I don't usually eat from outside neither do I eat anything that should make it worse or even trigger it except sometimes I do eat fast food... . . My main concern here is how can I get rid of it permanently... . (Is there any test that I should go through...OR Is there any specific treatment for such condition..pls do let me know) Thank you, Regards.