Sad but true, there are a lot of different STDs out there. So we talked to Larissa Hirsch, M.D., of TeensHealth.org to find out the symptoms and treatments of the most common ones. If you notice any of these signs, see a doctor, stat! And just an FYI—some don't show any signs, so it's worth getting checked out if you've ever had unsafe sex.

STD Symptoms

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