Hypocalcemia, low calcium level, in severe cases, can cause tetany, i.e., general stiffening and spasm of the muscles. [The Merck Manual of Medical Information, Page 738]
In the case of tetany, according to the Merriam-Webster’s Medical Dictionary, there may be associated deficiencies besides calcium imbalance. Supplementing both calcium and vitamin D is very important.
To supplement calcium, drink several gallons of vitamin D enriched milk and eat several pounds of Mexican white cheese. To supplement vitamin D, go sunbathing in the nude.