7 Reasons Your UTIs Keep Coming Back After The Antibiotics Are Finished

Nearly every woman I see with a recurring pattern is holding it, and she has a reason. She is with patients, or in a classroom, or on a ward, or in the back of a car on a road she does not control. So she waits. Three hours becomes five.

Two things happen while she waits. Urine that sits gets more concentrated, and concentrated urine is the version that leaves deposit behind on the bladder wall. And a bladder held at capacity for hours at a time stops emptying cleanly when she finally does go — there is always a little left, and what is left is the most concentrated part of it.

The women with the worst patterns in my clinic are almost never the ones with the least willpower. They are nurses, teachers and drivers.

This is not an argument against antibiotics. If you have an infection, take them, finish them, and do not let anybody on the internet talk you out of it. They work, and they work fast.

But be clear about what the course actually did. It cleared the urine. Three days in, the sample runs clean. That is the whole job, and it is the job it is designed for.

What it does not do — what it was never built to do — is change the surface of the bladder wall. Whatever was sitting on that wall in February is still sitting there in March. The urine is new. The wall is not. And a woman who is on her fourth course in a year has now had four conversations about the urine and none at all about the wall.

Cranberry is not the problem here, and I want to be careful with this one, because it is genuinely a good ingredient and it has been let down by the form it is sold in.

The active fraction in cranberry is a group of compounds called proanthocyanidins. A standardised 30% extract concentrates them. A carton of juice from the supermarket does something close to the opposite: it is mostly water and apple or grape concentrate, it is often under 5% cranberry, and it carries twenty-something grams of sugar per glass to make it drinkable.

So the woman drinking two glasses a day is doing something genuinely worthwhile, at somewhere near a hundredth of the strength she thinks she is, with a sugar load she does not want. She then decides cranberry is not for her. It was never given a fair go.

This one is completely understandable and it makes everything worse.

When it burns, the last thing you want is another reason to sit down. So the glass by the sink stops getting refilled, and by the afternoon you are running on half of what you were drinking a month ago.

Less water does not mean less trouble. It means the urine you are making is more concentrated, and concentrated urine is more irritating on tissue that is already sore — which is why it burns more on the days you drink least, and why a woman can end up convinced her bladder is getting worse when what changed was the water.

I am not asking you to flood yourself. Volume is not a cure and anyone telling you to drink four litres is not thinking about your evening.

Now the one I care most about.

Somewhere between the first infection and this one, somebody told you to wipe a particular way. Somebody else told you to change your underwear, change your soap, stop taking baths, empty afterwards, wash before, wash after. Each piece of advice was well meant. Stacked up over fifteen years they add up to a single message, and you have heard it clearly: this happens because of something you are doing.

I have scoped the bladders of women who follow every one of those rules without exception, and women who follow none of them. I cannot tell them apart on the screen. What I can see on the screen is which walls are clean and which are not, and that is not a question of soap.

So put it down. It is not a character flaw and it is not something you brought on yourself, and I would rather you spent that energy on the wall.

Here is what I see through a scope, and what almost no woman with a recurring pattern has ever been shown.

A healthy bladder wall is pink, wet and even. Put a scope into a bladder that has been going through this for a decade and there is something else on it: a pale, gritty, chalk-coloured film, laid down in layers, adhered to the tissue. Mineral salts and acid crystals that came out of her own urine, one concentrated day at a time, over years.

Two things follow from that, and they are the whole reason I write about it. Deposit like that gives the surface texture where it should be smooth, and a surface with texture is a surface things settle into and stay on. And coated tissue does not stretch — so the wall reports full at a third full, which is the urgency, the frequency, and the trip you make at two in the morning for almost nothing.

Nothing in a course of antibiotics goes near it. Nothing in the advice about soap goes near it. It is simply not on the list of things anyone checks, and it has been there the whole time.

This is the one that makes me angry, and not at the patient.

Somewhere around the fourth or fifth episode a woman stops expecting the problem to be solved and starts managing it instead. She keeps a strip of sachets in the glove box. She knows which pharmacy opens on Sunday. She has a GP she can get a prescription from without a full appointment, and she treats that as a small victory rather than what it is.

And when she asks whether anything can actually be done, she is told, kindly, that this is common in women her age. Common is a description. It is not a cause, and it is not a reason to stop looking.

Common is also what I am counting on: this is common precisely because the thing driving it is common, and it is common because nobody looks at it.