Chronic Kidney Disease (CKD)
what is
chronic kidney disease?
Chronic Kidney Disease (CKD) is a long-term clinical condition in which the kidneys gradually lose their ability to function effectively. It is defined as kidney damage or reduced kidney function persisting for at least 3 months.
CKD is a progressive clinical syndrome with multiple causes. In early stages, it is often asymptomatic, which is why it is commonly referred to as a “silent disease.”
Healthy kidneys are essential for:
Removing waste products and excess fluid
Maintaining electrolyte and mineral balance
Supporting red blood cell production via erythropoietin
Maintaining bone health through vitamin D activation
Regulating blood pressure
When kidney function declines, waste accumulates in the body, fluid balance is disrupted, and the risk of cardiovascular disease increases significantly. In advanced stages, kidney failure may require dialysis or kidney transplantation.
How CKD Develops
CKD develops due to long-term damage to the kidney’s filtering units (nephrons), leading to gradual loss of filtration capacity.
Common causes include:
- Diabetes mellitus (most common cause)
- Hypertension
- Chronic glomerular diseases
- Genetic or Inherited conditions, such as polycystic kidney disease
- Autoimmune disorders (e.g., lupus)
- Structural kidney abnormalities or recurrent infections
- Long-term exposure to nephrotoxic medications or toxins
- Long-standing urinary tract obstruction (e.g., recurrent kidney stones)
Risk Factors for CKD
Risk factors increase the likelihood of developing CKD but do not represent established kidney disease.
Common risk factors include:
- Diabetes mellitus
- Hypertension
- Cardiovascular disease
- Obesity
- Age above 60 years
- Family history of kidney disease
- History of acute kidney injury (AKI)
Signs and Symptoms
CKD often remains asymptomatic in early stages. Symptoms usually appear when kidney function is significantly reduced.
Possible symptoms include:
- Fatigue and reduced energy
- Loss of appetite or nausea
- Changes in urination patterns
- Foamy urine (protein leakage)
- Dry or itchy skin
In advanced stages:
- Swelling in legs, ankles, or around eyes
- Muscle cramps or weakness
- Shortness of breath
- Difficulty concentrating
- Vomiting or sleep disturbances
Complications of CKD
As kidney function declines, systemic complications may develop:
Cardiovascular disease
(heart attack, stroke)
Anemia due to reduced
erythropoietin
Bone and mineral
disorders
Metabolic
acidosis
Electrolyte imbalances
(e.g., hyperkalemia)
Progression to
kidney failure
Diagnosis
CKD is diagnosed using blood and urine tests:
- eGFR (blood test): Measures kidney filtration function
- uACR (urine test): Detects albumin
In advanced stages:
- eGFR is <60 mL/min/1.73 m², or
-
uACR is ≥30 mg/g,
and abnormalities are persistent for ≥3 months and confirmed on repeat testing.
Key Message
Chronic Kidney Disease is a progressive but manageable condition. Because it often develops silently, early detection through routine testing is essential.
With timely intervention, effective control of underlying conditions, and regular monitoring, CKD progression can be slowed and complications significantly reduced.