Diathermy, a therapeutic technique involving the use of high-frequency electric currents to generate heat in body tissues, has numerous synonyms that can be used interchangeably depending on context. These include electrosurgery, electrocautery, thermal therapy, radiofrequency ablation, high-frequency energy therapy, and high-frequency electrotherapy. Electrosurgery is a surgical procedure that uses a high-frequency electric current to cut through or coagulate tissues. Electrocautery is a medical technique that uses an electric current to harden or burn tissues. Thermal therapy is a treatment that uses heat to alleviate pain and improve circulation. Radiofrequency ablation is a medical technique that uses a high-frequency electric current to destroy cancerous tissue. Lastly, high-frequency energy therapy and high-frequency electrotherapy are therapeutic techniques that use high-frequency currents to produce heat within the body to treat various conditions.