Stage 4 kidney disease, also known as stage 4 chronic kidney disease (CKD), is characterized by significantly reduced kidney function. The kidneys are responsible for filtering waste products and excess fluids from the blood, and when they are functioning at only 15-29% of their normal capacity, it indicates that the disease has progressed to this advanced stage.
### Key Features of Stage 4 Kidney Disease:
1. **Symptoms**: Some common symptoms


