Diathermy is a medical treatment that uses high-frequency electrical currents to generate heat within body tissues. This heat can help relieve pain, reduce inflammation, and promote healing by increasing blood flow to the affected area. It is commonly used in physical therapy and rehabilitation settings. There are different types of diathermy, including shortwave diathermy, microwave diathermy, and ultrasound diathermy. Each type varies in frequency and depth of penetration, making them suitable for different medical conditions. Diathermy is generally considered safe when performed by trained professionals.