Provided is a therapeutic or prophylactic agent for generalized pain syndrome, for which no cause and therapies have been established. A therapeutic or prophylactic agent for generalized pain syndrome containing an LPA1 antagonist or autotaxin-inhibiting substance as an active ingredient. The pharmaceutical is preferably administered to the central nervous system. The generalized pain syndrome is preferably fibromyalgia, chronic fatigue syndrome or hypersensitivity colitis.
