could be a wet swimsuit, a penis that doesn't agree with ur biology, dirty underwear, underwear too tight, and what they said^. a lot of shit

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Candida in gut like if u took a lot of antibiotics or ate a lot of sugar

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Some yeast is always present in a healthy vaginal flora but it becomes an infection when it becomes too dominant. Lots of things can throw off that balance: antibiotics and other medications, diet changes, hormonal changes, dirty/wet underwear, non-breathable fabrics, a dirty hand/toy/dick, sweat and heat, soaps. The list of ways to avoid them is probably shorter: breathable underwear, sanitary contact only, wash with water alone, never wash internally, stay hydrated.

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