Abstract: A handheld treatment device is configured to apply one or more treatment modalities to a user. The treatment device can include a heater, a massager, and an electrical energy generator that applies current to a user's body via EMS or TENS. The treatment device may also include a thermoelectric cooler. A control interface is configured to activate one or more of the heater, the thermoelectric cooler, the massager, and the electrical energy generator. The treatment device may be battery-powered.