Quick answer:
If things smell “onion-y” down there, it’s usually from sweat + normal bacteria, diet (onions/garlic/spices), sex/semen, tight clothing, or a temporary pH shift.

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Most common reasons:
• Sweat + friction (workouts, long days)
• Tight/non-breathable underwear or leggings
• Diet (garlic/onions)
• Semen can change smell for 24–48 hours
• Hormone shifts (cycle changes)
• Dehydration

When to get checked:
If you also have itching, burning, unusual discharge, a fishy smell, pelvic pain, fever, or symptoms that don’t improve in a few days.