The word of Kaishun is simply used in the meaning of "to regain the decline of sex libido" in current Japan.But original meaning is a little different.44176941_ml

In the late 16th century in China,Kyo Teiken,who is a doctor of court,wrote a 「万病(=ALL DISEASES)回春(=KAISHUN)」. 
「万病(=ALL DISEASES)回春(=KAISHUN)」is brought over to Japan in the early Edo period by his disciple.