PSD, which stands for pubic symphysis dysfunction, is more commonly known as symphysis pubis dysfunction, or SPD. A more general term for this disorder is pelvic girdle pain, a condition that affects about one in five pregnant women, according to GP Online.

Medical conditions causing irritation of the vagina and a woman's sensitive external genital tissues often cause similar symptoms, including pain, burning and itching. If you experience such symptoms, you may suspect a yeast infection or sexually transmitted disease, such as genital herpes.