Sometimes a specific injury can produce numbness or tingling, such as an injured nerve in your neck or a herniated disk in your spine. Placing pressure on a nerve is a common cause. Carpal tunnel syndrome, scar tissue, enlarged blood vessels, infection, or a tumor can all place pressure on a nerve.
The symptoms will vary from person to person and individuals may have different symptoms during different attacks. Your attacks may differ in length and frequency. Migraine attacks usually last from 4 to 72 hours and most people are free from symptoms between attacks.
* 3 percent of the population suffer from chronic migraines -- 15 days a month. * 90 percent of migraine sufferers are unable to work or function normally during their migraine. * Migraines cost the U.S. economy $20 billion each year -- in medical expenses, missed work and lost productivity.