Hi, Usually kidney stones cause pain when they enter pelvis (the exit pathway for urine from kidney) or ureter (tube connecting pelvis of kidney with bladder). If the size of stone is small (less than 10 mm) and the obstruction is mild (assessed by ultrasonogram or CT scan), it is managed medically (using alpha-blockers) as long as the patient is asymptomatic (up to 4 weeks). I would like to know some more details regarding your problem: What is the size and location of your stone? How much is the swelling in your left kidney? Are you taking alpha-blocker drug - e.g. tamsulosin? What is your serum creatinine level? Since you are having pain and it is already one month, it is advisable to get re-assessed by a Urologist and plan for stone removal. Stone removal can be done by lithotripsy or ureteroscopy, depending on the size and location of the stone. Meanwhile, keep yourself hydrated (drink at least 3 liter fluid everyday) and take tamsulosin 0.4 mg once a day (you need to get the prescription from your physician). I am available to guide you further. Please get back to me with the above mentioned details along with your age, sex and associated medical conditions. Wish you a speedy recovery, Dr. Raguram.