Most people don't know that the genital herpes virus (HSV-2) can cause intense back, groin, and leg pain. Research shows that the first outbreak almost always causes these symptoms. In fact, a person may experience "flu-like symptoms - such as feeling unwell, headaches and pains in the back and legs, with or without enlarged glands in the groin, and … some people also have considerable pain and swelling in the genital area, and may have additional pain and difficulty passing urine." (1)