During the hip operation, the patient is given IV (intravenous) fluids to replenish the body’s fluids and balance the sodium levels. The IV fluids can result in some bloating while the body regulates its fluid levels after the surgery. Although it can be uncomfortable, rest assured that a bloated stomach after hip replacement is a normal part of the recovery process and will subside on its own over time. If the problem still persists after a few days, you should speak to your surgeon.