When Urine Stops After Months of Alternating Ureteral Stents and Nephrostomy Tubes — What Separates Bladder Outlet Retention, a Failed Diversion, Bilateral Upper-Tract Blockage, and Infection, and What to Write Down Before the ER Desk

For people who have been in cancer treatment for years, an emergency sometimes begins not with the disease itself but with a passage that has closed. The urinary tract is one of those passages. Tumor tissue or lymph nodes in the pelvis can press on a ureter from the outside, and scarring left behind by surgery or radiotherapy can narrow it gradually. When urine made by the kidney cannot drain downward, the collecting system swells — a condition called hydronephrosis — and over time that kidney loses function. Creating a detour for the urine therefore becomes part of the treatment plan rather than a side issue.

There are two common detours. A ureteral stent (often a double-J stent) is a thin tube placed inside the ureter so urine can travel from the kidney to the bladder. Nothing exits the body, which makes daily life easier, but if outside pressure on the ureter is strong, urine may still drain poorly even with a stent in place. A percutaneous nephrostomy (PCN) instead passes a tube through the skin of the flank directly into the kidney and drains urine into an external bag. Drainage is more reliable, but the tube and bag are always present. Both devices accumulate mineral deposits and eventually clog, so they are usually exchanged every few months. When one approach stops holding, teams may switch to the other or alternate between them. A shortening exchange interval does not by itself mean the cancer has advanced; it reflects anatomy and how long a particular tube keeps working.

The difficulty is that the sentence I cannot pass urine points to several different situations at once. First, urine may be collecting normally but blocked below the bladder — urinary retention. The lower abdomen feels tight and distended, the urge is strong, and little or nothing comes out. Opioid painkillers, some antiemetics and antidepressants, anticholinergic ingredients in cold remedies, and severe constipation are frequent triggers. Second, the diversion itself may have failed: a stent that has clogged or migrated, a nephrostomy tube that is kinked, compressed, or has slipped out. For anyone using a nephrostomy, a sudden drop in the volume collected each day, or leakage around the insertion site, is an important clue. Third, both upper tracts may be obstructed, or the kidneys may simply be receiving too little fluid — vomiting, diarrhea, and reduced intake often overlap here. Fourth, infection: bacteria growing behind an obstruction cause obstructive pyelonephritis, which can progress to a whole-body infection within hours.

That makes it worth agreeing in advance on what can wait and what cannot. Fever or shaking chills, flank or back pain that feels jarring when tapped, a distended and painful lower abdomen, passing almost no urine for more than half a day, a nephrostomy tube that has come out, heavy blood in the urine, confusion, or a low blood pressure reading are all reasons not to wait for the next scheduled visit. During chemotherapy this threshold is often set lower still, because a period of low white cell counts may coincide. Passing urine once does not reliably prove the blockage has cleared, and urine that dribbles out in small amounts can represent overflow from a full bladder rather than a resolved problem.

If the decision is to go in, a single sheet prepared before reaching the desk speeds everything up: the time and volume of the last void; daily urine output over the past three days, including how often a drainage bag was emptied and at what markings; changes in color and odor; the exact time and value of any temperature reading; where the pain is and when it started; the date and place of the most recent stent or nephrostomy placement or exchange, and when the next exchange is due; every current medication plus anything newly started or changed; the most recent kidney function results with the date they were drawn; and any allergies or prior contrast reactions. In the emergency department, ultrasound or CT is typically used to see whether the kidney is swollen and whether the tube sits where it should, alongside urinalysis, urine culture, and blood tests.

Once the acute episode passes, some questions belong in the next clinic visit: whether to keep the current diversion or change approach, whether the exchange interval should be adjusted, how to record urine output at home, and exactly whom to call for fever during the day and overnight. Because drugs cleared by the kidney sometimes need dose recalculation when function declines, it is also reasonable to ask whether the urology team and the oncology team are working from the same recent numbers.

One more thing: the body of the person providing care is also a patient. Elbow and shoulder pain from bearing someone else's weight on one side, a cough that will not clear, a tight chest and shallow breathing while waiting in an emergency department — these all have names and, in most cases, treatment. As caregiving stretches on, putting the caregiver's pain, sleep, and mood on the visit agenda as their own items tends to serve both people better.

This article is general information and does not replace diagnosis or treatment for any individual. Symptoms and circumstances differ from person to person, so please discuss actual decisions and care with your own medical team.