Save. Lightheadedness can be caused by a variety of conditions. It is a fainting or dizzy sensation primarily caused by a decrease in blood flow to the brain. High blood pressure, heart attack, pregnancy, anxiety and depression are common reasons why an individual may experience feeling lightheaded.
California is currently using thirty two area codes, six of which were created as area code overlays. Area Code 628 is the most recent area code introduced. It was implemented as an overlay of area code 415 on March 21, 2015. California originally had three area codes, 213, 415, and 916 when the numbering system was established in 1947. By 1951, just four years later, California experienced sufficient growth in population and telephone use to need an additional area code.
Throughout the 1960s and the 1970s no new area codes were introduced. Two area codes were put into service in the 1980s and from 1991-1999 California put fifteen area codes into service. All fifteen were the result of area code splits. Between 2004 and 2015 seven new area codes were introduced of which six are area code overlays.