###Human: I have thigh pain at night. Why? ###Assistant: Hi. I have reviewed your query. You can consider doing an epidural steroid injection for controlling the painful episodes. You should discuss the option with your physician for doing it. You can also have a hip joint issues. You can also consult an orthopedist for knowing the cause. I would recommend visiting a gynecologist for proper evaluation and try to have a second opinion on this issue. She would be in a better position to investigate you. There can be an infection or inflammation such as PID (pelvic inflammatory disease) or any other malformations related to female organs. It may also be a cause.