If so, what causes this weakness?

Kidney failure doesn't just make you tired. As the organs shut down, your bones stop making blood, toxins flood your nervous system, and your body begins digesting its own muscles.

While most people think of the kidneys merely as a filtration system, they
are actually highly active chemical factories. When they fail, multiple biological
systems crash simultaneously, causing profound weakness in several distinct ways.

The primary culprit for this weakness is severe anemia. Healthy kidneys produce erythropoietin (EPO), a hormone that signals the bone marrow to manufacture red blood cells.

As the kidneys shut down, EPO production plummets. Without enough red
blood cells to carry oxygen to the brain and muscles, the body's tissues literally begin to suffocate, resulting in lethargy and shortness of breath even
at rest.

Simultaneously, the body is poisoned from within. A failing kidney can no longer
clear urea, creatinine, and other metabolic waste products from the bloodstream.

This buildup, known as uremia, acts as a systemic toxin. It severely impairs muscle function and affects the central nervous system, causing a heavy, sluggish feeling and cognitive fog.

Electrolyte chaos further paralyses the muscles. Kidneys are responsible for keeping vital minerals like potassium and calcium in perfect balance. In end-stage
renal disease, potassium levels spike, a condition known as hyperkalemia.

High potassium alters the electrical impulses that tell muscle fibers to contract,
leading to heavy, weak limbs and painful muscle cramps.

Failing kidneys also lose their ability to excrete the daily acid load produced
by cellular metabolism. To neutralize this rising acidity - a state called metabolic
acidosis - the body begins breaking down its own muscle tissue to release neutralizing buffers. Over time, this constant state of muscle catabolism directly strips away physical strength.

Full story: https://www.quora.com/Does-kidney-failure-lead-to-weakness-over-time-If-so-what-
causes-this-weakness

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