Shoe lifts, also known as heel lifts or shoe inserts, are small inserts that can be placed inside a shoe to add height to the heel. They are often used by individuals who have one leg shorter than the other. While shoe lifts can help to alleviate pain and discomfort caused by leg length discrepancy, they may also cause problems if not used properly. It is important to consult with a healthcare professional before using shoe lifts, as they can affect the alignment of the spine and cause strain on the knee and ankle joints. Additionally, it is recommended to use shoe lifts only for a short period of time, and to gradually increase the height of the lift to avoid injury.