Pregnancy-related pelvic girdle pain: This condition is very common in pregnancy, especially in the second and third trimesters, due to hormonal changes that loosen ligaments and the weight of the growing fetus putting strain on the pelvis and hips.

Sciatica: Pressure on the sciatic nerve from the growing uterus or a herniated disk can cause hip pain that radiates down the leg.
Symphysis pubis dysfunction (SPD): A condition where the ligaments that normally keep the pubic bone aligned become relaxed, causing pain and instability in the pelvis and hips.
Osteitis pubis: Inflammation of the pubic bone and its surrounding structures, which can be exacerbated by pregnancy.

Deep vein thrombosis (DVT): Although less common, DVT can cause hip pain and is a serious condition that requires immediate medical attention, especially in pregnancy where the risk is increased.
Osteonecrosis of the femoral head: A condition where the blood supply to the bone is interrupted, leading to bone death. Pregnancy can increase the risk due to increased pressure and hormonal changes.
Septic arthritis: A bacterial infection within a joint, which is a medical emergency requiring prompt treatment to prevent serious complications.

Transient osteoporosis of the hip: A rare condition characterized by temporary bone loss in the hip, which can cause pain and is more common in pregnancy.
Pregnancy-associated osteoporosis: Although rare, some women may experience a significant loss of bone density during pregnancy, leading to fractures or hip pain.
Avulsion fractures: Small fractures where a fragment of bone is pulled away by a tendon or ligament, which can occur due to the increased stress on bones and ligaments during pregnancy.