In 1963, Keisetsu Otsuka reported painful groin as a typical abdominal sign for tokishigyakukagoshuyushokyoto (TSG) sho (indication). In 1974, he also reported Senki syndrome type A. However, this useful abdominal sign was not described as a ‘painful groin' medical term by him. By investigation his pupil's descriptions, the author revealed that this ‘painful groin' term was commonly used in their articles. The author has recently found that inguinal pain accompanies muscle contraction and hyperalgesia in this region clinically. Thus, these sign in the groin should be considered as noted in the diagnosis of TSG sho.