What are the uses of mint leaves?

While i was in Peru one day i wasnt feeling that well it could have been a slight touch of altitude sickness,,i got a couple of cup,s of a type of mint tea &it worked wonder,s .i was already taking coca mate to stave off that sickness, which worked,,but what ever that andean mint was it worked wonders ,the peruvian indians make it in the ande,s great stuf!