When the urine contains excess calcium, crystals may develop. These crystals can combine and form kidney stones. In severe cases, the excess calcium in the body can interfere with the kidney's ability to eliminate fluid and clean the blood, resulting in kidney failure. Arrhythmias (abnormal heartbeat) and osteoporosis, a bone-thinning disease, can also occur. In rare cases, very high calcium levels in the blood can lead to dementia and life-threatening coma.
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