LITTLETON, Colo.--(BUSINESS WIRE)--Zynex Medical Holdings, Inc. (OTCBB: ZYNX), a provider of pain management systems and electrotherapy products for medical patients with functional disability, announces it has leased additional office space in close proximity to its existing location. Zynex has signed a 25-month lease for a 16,553-square-foot mixed office and warehouse at 8022 Southpark Circle, Littleton, CO 80120.