Diathermy is a natural sciences term which means electrically induced heat. This is a form of physical or occupational therapy and is also sometimes used in surgical procedures. Diathermy machines are commonly used for therapeutic muscle relaxation and can be used to heat muscle tissue through electromagnetic or ultrasonic means. Applications for diathermy machines may increase patients blood flow; their rate of metabolism; increase ion diffusion across cellular membranes; provide pain relief, decrease muscle spasms and increase muscle-skeletal flexibility by stretching the fibrous tissues in tendons and in joint capsules and scars. Diathermy applications relative to the vascular system will speed coagulation; prevent excessive bleeding and seal off traumatized areas of injured tissues. Diathermy machines applications address Diathermys three forms: shortwave, ultrasound and microwave.