This chapter investigates the stability and dynamical response of cavity-Rydberg systems under optomechanical coupling. Topics include optical multistability, coherent and incoherent dynamics, and the emergence of bistability in hybrid Rydbergoptomechanical systems. Mechanisms of cavity-Rydberg hybrid transduction, such as conversion between millimeter-wave and optical signals, are developed in detail. The interplay between strong atomic nonlinearities and mechanical degrees of freedom reveals novel avenues for hybrid quantum devices that integrate atomic and mechanical platforms.