email address missing from contacts

Hey there Hazel1927,

That's a strange thing to occur, so we'd like to confirm more details to better understand what's happening, along with ruling out some possible causes:

1. You mentioned that an email address disappeared from one of your saved contacts, but we wanted to confirm if this has only occurred with that one specific contact?
2. When did this occur?
3. Do you recall changing any account settings, or even deleting an account you once had set up to sync with Contacts app on your iPhone? You can check which accounts are syncing with Contacts that are currently set up in your iPhone by tapping upon each account under Settings > Contacts > Accounts.
4. Sometimes unexpected behavior can be resolved with a restart: Restart your iPhone
5. If you have a compatible iPhone model, the latest version is iOS 16.3. You can verify this within Settings > General > About. In case you needed it, this link shows how to first back up, then Update your iPhone or iPad.

Cheers!

Hey there Hazel1927, 

You mentioned removing a number of apps. It may be helpful to explore what apps were removed. For instance, were any email or messaging apps removed? If so, are you still signed in to the email address for the apps that were removed?

Use other contact accounts on iPhone: Use other contact accounts on iPhone - Apple Support   

Have a good one!