How common is blood in urine in sickle cell disease?

Sickle cell disease can affect the kidneys and the tiny blood vessels that help concentrate urine. This may allow red blood cells to enter the urine, making it pink, red, or tea-coloured. Sometimes the blood is visible; sometimes it is found only on a urine test. The amount may change over time, and an episode can occur without the other pain symptoms of a sickle cell crisis.

Blood in urine can also arise from a urine infection, a kidney stone, medicines, or another kidney problem. The symptom therefore needs assessment even when you already have a sickle cell diagnosis. A clinician may ask when it started, whether there is pain or fever, and whether you can pass urine normally.

Contact your sickle cell team or a clinician promptly when you notice visible blood. Keep drinking your usual fluids unless a clinician has told you to restrict them, and note the colour, clots, pain, fever, and any change in urine output. Do not stop prescribed medicines without advice.

Assessment may include a urine sample, blood tests, and checks of kidney function. The treatment depends on the cause and may involve managing a urinary infection, reviewing medicines, or arranging kidney-focused follow-up.

Seek urgent medical care if the urine is heavily bloody, contains clots, or the bleeding is increasing. Get urgent help for severe side or back pain, fever, vomiting, dizziness, fainting, marked weakness, or difficulty passing urine. These features can signal significant bleeding, infection, obstruction, or another problem needing immediate treatment.

Ask whether the pattern fits kidney involvement from sickle cell disease, whether you need urine and kidney-function tests, and which symptoms should prompt emergency assessment. You can also ask whether any current medicine could contribute and when your results should be reviewed.