Not all headaches represent migraines, and migraine is not the only condition that can cause severe and debilitating headaches. For example, cluster headaches are very severe headaches that affect one side of the head in a recurrent manner (occurring in a cluster over time).
The United States government is the largest issuer of debt securities, and its bonds are considered the safest fixed-income investments available to your customer.
Foreign holders of United States treasury debt. According to the Federal Reserve and U.S. Department of the Treasury, foreign countries held a total of 6 trillion U.S. dollars in U.S. treasury securities as of May 2017. Of the total 6.012 trillion held by foreign countries, Mainland China and Japan held the greatest portions.