Disclosed are systems and methods of a health monitoring device comprising: a flexible circuit, an absorbent product, and, a processing unit. The flexible circuit comprises: an electrochemical biosensor, a color sensor, an LED, and, a moisture sensor. The electrochemical biosensor comprises a plurality of reference electrodes. The processing unit comprises: a GPS antenna, a power unit, a bluetooth low energy transceiver, a GPS transceiver, a microcontroller, and, an accelerometer. The processing unit is electronically coupled to the flexible circuit. The methods comprise: obtaining health data from health monitoring device； recording the health data on the memory unit； transmitting the health data to a data communication device； and, displaying the health data on the data communication device.
