Hi, Thanks for writing in. The stone in kidney might be 20 mm in size. This is a large stone and will not respond to oral medical treatment. Since the stone has been broken to two parts, it is still large and can cause obstruction in the kidneys or urinary tract. The swelling, fever and pain is due to the obstruction and probable infection in the block in passage of urine. It is important that he continues taking allopathy treatment as per instructions of his urologist. If there is hydroureteronephrosis then he must consult his doctors regularly because obstruction to passage of urine for more than ten days can cause obstructive uropathy and this can cause permanent damage to the affected kidney. Doing regular kidney function tests is important. If required inserting a double J stent in to the affected kidney might be needed to restore proper functioning even in the presence of smaller stone fragments after lithotripsy.