I have frequent urination, and sometimes(not everyday)burning sensation problem since last 2 month , recently i have done usg of kub and report says all are normal , done urine RE test which shows pus cells occasional, epithelial cell 3-4, erythrocyte occasional, all other are normal , 2.5 month ago i had usg which shwos less than 3mm stone in both kidny, but in recent usg there is no stone,