Appleâs introduction of the Health app made it easier to track vital signs. By inputting your weight, height, and other health-related information, it serves as a quick reference app for medical issues and information. Combining the technology with devices like Apple Watch gives you an instant tracker of your heart rate, blood pressure and temperature. Appleâs Health app needs permission to store this type of information. That makes it easy to get a historical overview of your vitals. This is handy when working out, watching your calorie intake and general well-being. But why do some random apps need access to your health data? They donât!