How can sickle cell disease affect the kidneys?

The kidneys filter blood and balance water and salts. The inner part of the kidney has naturally low oxygen conditions, which can make it vulnerable when sickle-shaped cells restrict small-vessel flow. A person may pass urine more often, produce dilute urine or notice blood in the urine. Kidney involvement may be present without obvious symptoms, so monitoring can find changes before they become noticeable. Fatigue or pain can have several causes and does not by itself show that the kidneys are affected.

Tell the treating team about changes in urination, blood in urine, swelling, thirst or pain in the side. Attend blood and urine checks recommended for sickle cell disease, and discuss blood pressure monitoring and medicines with a clinician. Avoid taking frequent anti-inflammatory pain medicines without advice, because some can strain kidney function. Keep hydrated according to your clinician’s guidance, particularly during illness or heat.

Seek prompt medical care for visible blood in urine, very little urine, new swelling, severe side or abdominal pain, breathlessness, confusion or sudden worsening illness. Fever with sickle cell disease also needs urgent assessment because infection can become serious quickly.

Ask which kidney checks you need, whether your urine or blood results have changed, how to manage fluids during illness, and which pain medicines are safest for your kidneys.