Blood in your urine (haematuria)

Posted on Thursday, February 19th, 2015


Cancers of the kidney and bladder kill nearly as many people in the UK as breast cancer yet they have nothing like its profile, and the cardinal sign of trouble – blood in the urine – isn’t always taken as seriously as it should be.

Obvious blood in the urine (haematuria) should never be ignored and always warrants further investigation, but there still seems to be some confusion as to what to do with people with traces which are invisible to the naked eye and only detected on testing with a dipstick. And this microscopic haematuria is a common finding, occurring in as many as 1 in 20 healthy individuals tested during medicals such as those done routinely for life insurance and licences / certification to race, fly or dive.

The National Institute for Health and Care Excellence (NICE) has issued guidance on how to manage microscopic haematuria but in my experience it is often ignored. The latest reminder that it is a potentially worrying finding comes from a study into whether invisible blood suggests an underlying cancer. In what the team describe as “the first robust study” into the link, researchers from the University of Exeter Medical School have just published findings showing that people over sixty testing positive for blood on dipstick have a 1 in 60 chance of having bladder cancer.

Of course that means 59 out of every 60 don’t – and that pick up rate will be much lower in younger patients – but even so it warrants further investigation irrespective of age. Causes range from cystitis to kidney disease, but if no obvious cause can be found microscopic haematuria should prompt referral to a specialist, and as matter of some urgency in patients over-50 who are more likely to have cancer of the kidney or bladder.

Obvious blood in the urine is a much easier problem to manage. It can occur normally with some infections of the urinary tract – other tell tale signs of which include needing to pee more often and stinging when you do – but if it is painless it should immediately raise a red flag and the patient be referred urgently.

Although bladder and kidney cancer are more common in the elderly they can strike much earlier as I have learned to my cost. My father-in-law died from kidney cancer when he was 79, but I have also lost two of my friends to the disease, one of whom was younger than me, so it now features prominently on my radar. And kidney cancer is on the increase with rates doubling in the UK over the last 40 years.

White middle-aged and elderly men are most at risk of kidney and bladder cancer. One in twenty-five men will develop one or other at some stage of their life, compared to around 1 in 50 women. Smoking remains the most important cause of both and the risk continues for some time after giving up (up to 20 years later in the case of bladder cancer), but obesity and high blood pressure are two other all too common risk factors for kidney cancer.

As with nearly all cancers the survival rates are much better if the disease is caught early, but if blood in the urine is missed or ignored then the diagnosis is often delayed complicating treatment and worsening the prognosis. Overall survival rates for both cancers are just over 50% (compared to 85% for breast cancer) and they kill around 10,000 people every year in the UK.

NICE currently advises against general screening using dipsticks to test for invisible blood in the urine because pick-up rate for underling disease is so low, but that doesn’t mean a positive test should be dismissed even if it is just part of an insurance medical. In most cases there will be a simple explanation, but for a small minority invisible blood can be the first sign of a serious problem. Don’t ignore it.

For more details on the Exeter study visit


  • Painless blood in your urine always requires urgent specialist referral
  • If the blood is accompanied by pain, and causes like kidney stones or infection suspected, then these must be confirmed with further testing. If the results comes back as negative then the patient should be referred for a specialist opinion to rule out other problems
  • And persistent infections associated with bleeding in patients over 40 require urgent investigation too
  • Visit for the full guidance on haematuria

3 Responses to “Blood in your urine (haematuria)”

  1. ali says:

    Hello I need advised I been having invisible blood in the urine for more then 10 years CT scan scan and camera inside the bladder was negative from anything but I am still worried no pain sometime some discomfort when passing urine but not much
    I am worried and need advice GP now days are told to save money for the NHS
    i appreciate all help I start to search on line about a solution since I can’ find it with a specialist
    kind regards

    • Dr. Mark Porter says:

      Hi Ali,

      Some people have “leaky” kidneys and produce microscopic amounts of blood in their urine. This should never be ignored but it sounds like you have been extensively investigated and that this is simply normal for you.
      Not much else I can add from here. One to discuss with your own GP if symptoms have changed.
      Best wishes

  2. Steve H says:

    Hi Mark- need your advice please.
    I had no idea that I had blood in my urine until a trip to visit my GP for something unrelated caused her to remark ” do you often have trouble with your kidneys…you have blood in your urine”. This was 3 months ago. I had to do several repeat urine tests before I was referred to the hospital ( last week) for an ultrasound of the kidneys and bladder. The doctor there said everything was normal and she would send a report to my gp the following week.
    In my following up appt with my gp , she tested my urine again and blood was still there. The Gp said that I may have to go back to the hospital for another test but couldn’t say when or why. She said it depends on whether the hospital deem it serious and they would write to me.

    As it stands, I’m unsure of the cause or if I should be alarmed and what tests I need to have to give me some peace of mind.

    Are you able to recommend appropriate next steps?

    Thanks you


    So currently, as we

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