When you hire an electrician, even for a small job like installing a light switch, be aware that most charge a minimum fee for a visit. But that fee will roll into the cost of the job. In other words, although an electrician may charge $70 just to walk in the door, that money might cover the first hour of work. The cost of the job will vary depending on the complexity and parts needed. One factor that often contributes to a job's complexity is access.
1 Kidney stones. Large kidney stones cannot enter the ureter but a stone less than 5mm in diameter can cause a sudden obstruction.  Blood clots may obstruct the ureter and this is usually seen with massive hematuria (blood in the urine). Bleeding in these cases may be due to tumors, papillary necrosis or kidney stones.
The ureter actively propels urine from the kidney down into the bladder. Ureteropelvic junction obstruction is a condition where blockage occurs at the junction where the ureter attaches to the kidney. This results in decreased flow of urine down the ureter and an increase of fluid pressure inside the kidney. Increased pressure inside the kidney can over time cause deterioration of kidney function. The obstruction can be either congenital (the patient is born with it) or develop over time secondary to trauma or change in body shape with age. The blockage can be due to scar tissue, kinking, a blood vessel or rarely tumor. SIGNS AND SYMPTOMS. Ureteral obstruction can cause flank pain on the effected side. The pain may be intermittent and some patients notice increased pain when drinking alcohol, coffee or increased fluids. The pain can sometimes be in the front of the abdomen and can radiate down to the groin.