<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, Ive been experiencing lower abdominal pain. Also, I missed my period this month and Im having trouble conceiving. When I do get my period, its really painful. What could be wrong with me?  <response>: It seems like you might be suffering from endometriosis. This is a condition where tissue similar to the endometrium, which is normally found inside your uterus, grows outside it. This can cause pain and discomfort, especially during menstruation, and affect your fertility. 