How does immobility cause renal stone?

Immobility can contribute to the formation of renal stones primarily through the increased excretion of calcium in urine, a condition known as hypercalciuria. When a person is immobile, the body may lose calcium from the bones into the bloodstream, leading to elevated calcium levels in urine. Additionally, immobility can reduce fluid intake and urine output, leading to more concentrated urine, which promotes the crystallization of minerals and stone formation. This combination of factors significantly raises the risk of developing renal stones.