Check your internet connection
Turn off Airplane Mode
Restart WhatsApp
Restart your phone
Update WhatsApp to the latest version
Clear WhatsApp cache on Android
Free up storage space on your device
Ask the sender to resend the message
Wait for the message to deliver if the sender is offline
Reinstall WhatsApp after backing up your chats
Restore your chat backup if the message was deleted
Check WhatsApp server status
Log out and log back into WhatsApp Web if using it