Thrush is a yeast infection (organism called candida albicans). It naturally occurs on our skin, the vagina and anywhere moist, groins, mouth and in nappy areas. It lives in balance with the surrounding bacteria but if the balance is upset, thrush overgrows and causes symptoms.
If thrush is recurrent it may be worthwhile treating your partner as well. If symptoms do not seem to be clearing up with treatment, it is worth considering sources of irritation – sanitary towels, panty liners, condoms, spermicides or chlorine from swimming pools.
If thrush occurs cyclically with the menstrual period, sometimes it is worth using regular preventative treatment in the middle of the cycle and may be worth discussing this with your GP.