It is estimated that 80 to 90 percent of the population experience tension headaches on occasion. Environmental headaches, especially in cities, are not uncommon, nor are those caused by stress. The Migraine Research Foundation reports that more than 4 million people have at least 15 migraines per month, with countless others suffering from these debilitating headaches on a less frequent basis.
If you suffer from headaches, you already...
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