Haematuria is defined as the presence of blood in the urine. It is either visible (frank) or non-visible (microscopic). It has many causes including: infection in the bladder, or kidneys or prostate (often associated with pain or discomfort on passing urine), stones in the urinary tract, bursting of a small blood vessel or, a tumour (cancer) in the bladder, kidneys or ureters.
Sometimes non-visible haematuria can be caused by some disorders of the kidney usually investigated by a nephrologist.
Most people who pee blood would probably think that this was a little worrying. Sometimes blood in the urine can be the first sign of a really important problem such as a bladder or kidney cancer. These problems are more common in current or ex-smokers but even people with a healthy lifestyle may have them. For many people however it is not associated with any major illness and may go away on its own. Because you as a patient can’t tell if blood in your pee is important or not you are encouraged to report it to your doctor urgently. If you see your GP with this problem they are likely to do a urine test to check for infection and antibiotic treatment may be needed if this is the cause.