Some of the most common symptoms of STIs include the following: - Abnormal discharge - Burning sensation during urination - Flu-like symptoms - Itching or irritation - Pain or discomfort during sexual intercourse - Rashes - Sores or bumps on the genitals It’s important to note that not all people with STIs will experience noticeable or visible symptoms. Some infections, such as HIV, may not cause symptoms for years which is why it’s so important to get tested regularly, especially if you’re sexually active.