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.
The governmentâs debt actually consists of two components: 1  Its public, or marketable, debt (treasury notes, bonds and bills) is held by investors outside the federal government. 2  The second component is intra-government debt in non-marketable securities.