Introduction : Interests in personalized medicine or tailored medicine is growing in recent years, but traditional medicine with properties of tailored medicine have already been developing from many parts of the world. In this review paper, we tried to investigate the current research status and characteristics of traditional constitutional medicine by a comparative study. Methods and Material : We compared Sasang medicine from Korea, Ikkando medicine from Japan, Chinese constitutional medicine, Ayurveda from India. We investigated the current research status by searching academic DBs such as Medline, Riss4u, Kiss, CNKI, CINII. Then we examined characteristics of each medicine from various aspects of physiology-pathology-diagnosis-treatment-prevention. Results : We found out that each constitutional medicine is being studied the most in their native land. In addition, after analysing characteristics of these constitutional medicine, we learned that Sasang medicine and Ayurveda were putting emphasis on psychological factors in physiology-pathology-diagnosis-treatment-prevention, while Chinese constitutional medicine and Ikkando medicine were focusing on pathological factors. Discussion : We studied theories of constitutional medicine in various traditional medicine, and verified that Sasang medicine shares similarities and differences with these medicine. We suggest that deeper understandings of other constitutional medicine and attempts at clinical application can lead to advance of Sasang medicine.