In the modern world, health monitoring systems are crucial. This system's purpose is to use sensors to measure the patient's body's biological parameters, such as temperature, heart rate, and oxygen saturation. The LM-35 temperature sensor is used to measure temperature. A pulse sensor is used to calculate heart rate. The associated registered number will automatically get an SMS using GSM when the oxygen level thresholds change. Arduino compares the patient's parameters to the values inside the usual range, and if the parameters are out of range, an SMS is automatically sent over GSM to the relevant registered number. The parameters are shown on an LCD screen.