Apple Health App not working

Try and Force Restart your iPhone EXACTLY as shown below and see whether that resolves the issue:

• Press and quickly release Volume UP button
• Press and quickly release Volume DOWN button
• Press and Hold the SIDE button until an Apple logo appears and then release the Side button (Can take up to 20 seconds. (DO NOT release Side Button when invited to Slide Power OFF). 

Axel F.

This did not resolve the issue still. I even tried changing my phone, but same problem on new phone too

I recommend that you contact 👉 Official Apple Support

Axel F.