Zynex, Inc. is a medical device manufacturer that produces and markets electrotherapy devices for use in pain management, physical rehabilitation, neurological diagnosis and cardiac monitoring.

[8] In 1996, Thomas Sandgaard founded Zynex Medical as a wholesaler of electrotherapy products.

[4][11] In 1998, the company received its first Food and Drug Administration approval for one of its products, “an electric-stimulation device that managed pain and increased blood circulation to promote healing.”[8] The company went public in 2004.

[3][15] In February 2019, Zynex Medical began trading on Nasdaq under the symbol ZYXI.

[16] In February 2020, Zynex received FDA clearance for their CM-1500 Cardiac Monitor.