Osteoarthritis or Postpartum Osteonecrosis: This condition is a common cause of joint pain, especially in the knees and hips, following pregnancy. The increased weight and altered biomechanics during pregnancy can exacerbate or precipitate osteoarthritis. Osteonecrosis, particularly of the hip, can also occur due to increased pressure on the joints and potential vascular changes during pregnancy.

Postpartum Rheumatoid Arthritis: Some women may experience the onset of rheumatoid arthritis postpartum, characterized by symmetric joint pain, swelling, and stiffness, particularly in the hands and feet, but can also affect larger joints like the knees and hips.
Postpartum Back Pain: Back pain is common postpartum due to the strain on the back during pregnancy and childbirth. It can range from dull aching to sharp pain and may be exacerbated by lifting, bending, or prolonged sitting.
Fibromyalgia: This condition is characterized by widespread musculoskeletal pain, fatigue, and tender points. It can be triggered by various factors, including hormonal changes and stress, which are common during and after pregnancy.

Osteoporotic Fractures: Although less common, osteoporotic fractures can occur, especially in women with a history of osteoporosis or those who have experienced significant bone density loss during pregnancy. These fractures can cause severe, sharp pain and are critical to diagnose early to prevent further complications.
Septic Arthritis: This is an infection within a joint, which can cause severe, sharp pain, swelling, and difficulty moving the joint. It is a medical emergency requiring prompt diagnosis and treatment to prevent joint destruction.
Spinal Epidural Abscess: A rare but serious condition where an abscess forms in the spinal canal, which can cause back pain, fever, and neurological deficits. It requires urgent medical attention to prevent serious complications, including paralysis.

Transient Osteoporosis of the Hip: A rare condition characterized by temporary bone loss in the hip, leading to pain and difficulty walking. It is more common during pregnancy but can also occur postpartum.
Reflex Sympathetic Dystrophy (RSD): Now more commonly referred to as Complex Regional Pain Syndrome (CRPS), this condition is characterized by intense burning or aching pain in the hands or feet after an injury or trauma. It can rarely occur postpartum and is important to diagnose due to its challenging treatment and potential for significant disability.