An ectopic pregnancy occurs when a fertilized egg implants and grows outside the main cavity of the uterus, usually in one of the fallopian tubes. Symptoms can include light vaginal bleeding and pelvic pain. Without treatment, the growing tissue can cause life-threatening bleeding. Ectopic pregnancies are often caused by damage to the fallopian tubes from inflammation or infections that blocks the path of the fertilized egg. Treatment depends on symptoms and diagnosis but may involve medication or surgery to remove the ectopic tissue.