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The author states that pain may be described as of three fairly distinct types—surface pain, distinguished by sharp clearness, exactness of location and well coordinated reaction; bodily distress, characterized by obscure dulness, difficulty of exact location, and a general and somewhat aimless bodily reaction; and unpleasantness, marked by such obscurity that it is commonly spoken of as feeling. It has no particular location, but seems to pervade the whole body. Pleasure may be derived from stimulation of the surface of the body; gratification is the pleasure derived from satisfying the needs of the inner organs, a form of which is distinctly experienced for each of the body needs; then there is pleasantness, which is least capable of exact location or definition. Pain and pleasure as sensations have probably been evolved gradually out of a primitive obscure state of well-being, or pleasantness, and malaise, or unpleasantness. All three varieties of pain
Pain and Pleasure.. JAMA. 1917;LXIX(22):1904. doi:10.1001/jama.1917.02590490068023