Water Excess without Salt Excess

At the other extreme, when the concentration of dissolved solids gets below a certain limiting value, we lose all interest in drinking fluids. Our brains stop producing antidiuretic hormone. In the normal subject, this causes the urine to become very dilute and to increase enormously in volume. As a result, the concentration of dissolved solids returns to a normal value. In the subject with kidney disease, by contrast, there is little increase in urine flow and the urine doesn't become as dilute. Low concentration of dissolved solids is seen more commonly in patients with kidney disease than is high concentration of dissolved solids. This condition, when severe, is called water intoxication: its symptoms are variable, but often there is a severe headache.

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