The invention relates to a device including a temperature sensor, an information device and a central processing unit, which can process the information measured by the temperature sensor and trigger the signal sent by the information device. The invention also relates to a system comprising a device according to the invention and a server adapted to store information. The invention also relates to a method for monitoring a patient who may be dehydrated, and a device according to the invention for monitoring the hydration state of the patient.
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