This is often dependent upon functional congestion of the nerve-centres, and is amenable to different applications of water. The general tepid bath is suitable for children especially. A cold sitz-bath relieves after intellectual work, or even a cold compress of a folded wet towel placed on the epigastrium, and covered by a dry towel, is often very efficacious. A hot mustard foot-bath, while cold is applied to the head, or a rapid dipping of the feet in cold water and vigorous friction afterward, tend to the same result.