The kidneys filter waste and extra fluid from the blood and help regulate blood pressure. They are remarkably good at continuing their work even when under strain, which is why changes can go unnoticed.

What the kidneys do

The kidneys remove waste products, balance fluids and salts, and support blood pressure control. When their function changes, the effects can be subtle at first.

Changes worth discussing with a doctor

  • Swelling of the feet, ankles or around the eyes
  • Passing urine more or less often than usual
  • Foamy or discoloured urine
  • Persistent tiredness
  • Loss of appetite or nausea
  • A test report that mentions kidney function

Kidney health in diabetes and high blood pressure

Diabetes and high blood pressure are among the more common reasons kidney function can change over time. This is why people with these conditions are often advised to have periodic checks.

Why early changes can be silent

Early changes in kidney function may cause no symptoms at all. They are often found through testing rather than by how a person feels, which is why routine monitoring matters for people at higher risk.

What evaluation may involve

  • A discussion of your symptoms and fluid habits
  • Review of existing reports and medicines
  • A physical examination, including blood pressure
  • Urine and blood investigations if advised
  • A monitoring plan and follow-up interval
Your doctor will decide which investigations are appropriate for your situation. Not every person needs the same tests.

When to seek medical advice promptly

Passing very little or no urine, rapidly increasing swelling, severe breathlessness or persistent vomiting need prompt medical assessment rather than a routine appointment.

A note about symptoms

The symptoms above can have many causes, and they do not confirm kidney disease on their own. A clinical assessment is the appropriate way to understand what is happening.