<prompt> Ureteric colic due to stone is caused by:Stretching of renal capsule due to back pressureIncreased peristalsis of ureter to overcome the obstructionIrriation of intramural ureterExtravasation of urine  <response>: Acute obstruction of ureter dt calculus or other objects causes 2 types of pain: Non-colicky renal pain dt distension of the renal capsule occurs at a costoveebral angle just lateral to the sacrospinalis muscle and just below the 12th rib Colicky pain dt hyperperistalsis of smooth muscles of calyces, pelvis and ureter as it attempts to rid itself of the foreign body or to overcome the obstruction the colicky pain radiates along the course of the ureter, from the costoveebral angle down towards the lower anterior abdominal quadrant. the ureteric colick pain is referred to different sites depending on the site of obstruction of the calculus. Ref : Smiths Urology 16e, p 32, 264 