Message app gets stuck every time I re-open it after closing. It is happening since iOS16 Update

Hello Aditya2009,

For difficulties with the Messages app not responding, you'll want to take the steps below:

1. Close and reopen the app

Force the app to close. Then open the app to see if it works as expected.

2. Restart your device

Restart your iPhone or restart your iPad. Then open the app to see if it works as expected.

3. Check for updates

To see if updates are available for the app, open the App Store, tap your profile icon, then scroll down to see if updates are available. If updates aren't available for the app, update the software on your iPhone or iPad.

You can also find those steps in this resource: If an app on your iPhone or iPad stops responding, closes unexpectedly, or won’t open - Apple Support

Should that still persist, you'll want to reach out to Apple Support: Contact - Official Apple Support They'd be in the best position to assist further.

Take care.