7 out of every 10 people, or speaking geographically, 80% of the population of the the human race, suffer from certain sort of yeast infection at certain time in their lives. It's not merely women that can be affected with yeast infections - everyone can get them - men, women, children, babies, and the elderly.
Just like several of these people, you get certain medicine to treat the infection and it clears up. But after a while you get an infection again. That's because the medicines merely cleared up the symptoms but not the cause. There will continuously be a low level of the yeast cells still existing just waiting until conditions are right for another flare-up, because you haven't treated the actual caused of the infection in the first place. You need a permanent cure for yeast infection, a treatment that eliminates the root cause or virus.