Late-onset hypogonadism in male (LOH) is a common and frequently-occurring disease in middle-aged and elderly men, traditional Chinese medicine (TCM) and western medicine have different and unified understandings about the etiology, pathogenesis, diagnosis, and treatment of LOH. Taking the decrease of testosterone level as the key entry point, testosterone supplementation therapy (TST) is one of the important methods for LOH treatment, but its dosage, course safety and other issues have not yet been resolved. The TCM based on syndrome differentiation theory can improve the symptoms of LOH pati...