Hydrogels are highly flexible materials appropriate for IR 5.0 applications such as self-powered wearable devices due to their flexibility. It can improve the functionality of human-machine interface devices by providing high strain, high conductivity, a long-life cycle, and sustainability. However, there is no specific review on problems faced and solutions of the hydrogel electrodes in HMI device. Hydrogel electrodes when used as electrodes, can suffer from severe performance deterioration owing to evaporation of water molecules, freezing, incompatibility with conductive metallic nanoparticles, and hazardous nature in some scenarios. Therefore, this review focuses on these problems and corresponding solutions suggested in the literature to enhance the performance of human machine interface devices. Details of applications of hydrogel electrodes in HMI devices are included as well. Thus, the gap in the previous review will be filled by focusing particularly on increasing the human machine interface devices capability with the help of hydrogel materials.