Hypercalcemia
Another common symptom of William syndrome is high levels of blood calcium or hypercalcemia. It is caused when there are some damages to the brain area that is responsible for absorbing and regulating calcium. As a result, they could experience irritability and have some colic-like signs, particularly in infants. These problems tend to alleviate with age, but there might be lifelong issues with vitamin D metabolism and calcium levels. A special diet or medication may be needed to improve the quality of life. [5]
