Pregnancy-related pelvic girdle pain: This condition is common in the third trimester due to the relaxation of ligaments and increased mobility of the pelvic joints, which can lead to instability and pain, especially with movements like bending or standing for long periods.

Sciatica: Pressure on the sciatic nerve from the growing uterus or changes in posture can cause pain that radiates down the back of the leg, which might be exacerbated by movement.
Osteitis pubis: Inflammation of the pubic bone and its surrounding structures, which can occur during pregnancy due to hormonal changes and increased stress on the pelvic area.
Symphysis pubis dysfunction: A condition characterized by excessive movement of the pubic symphysis, leading to pain and discomfort, particularly with weight-bearing activities.

Osteonecrosis of the femoral head: Although less common, this condition can be precipitated by pregnancy due to changes in blood clotting and fat metabolism, leading to hip pain that worsens with movement.
Deep vein thrombosis (DVT): Pregnancy increases the risk of DVT, which can cause leg pain, swelling, and warmth, and is a medical emergency if it occurs.
Septic arthritis: An infection within the joint, which is rare but can be life-threatening if not promptly treated, especially in pregnant women who may have altered immune responses.

Transient osteoporosis of the hip: A rare condition that can occur during pregnancy, characterized by a temporary loss of bone density in the hip, leading to pain.
Pregnancy-associated primary bone tumors: Extremely rare, but certain bone tumors can appear or grow during pregnancy, causing hip pain among other symptoms.