The underside of my MacBook Pro bulges so it does not stand on all 4 rubber legs. The Mac tilts.

hans jørgen from svendborg wrote:

why, the underside of my MacBook Pro bulges so it does not stand on all 4 rubber legs. The Mac tilts.

The battery is failing and swelling causing the bugle— this is not good. Verify your machine is backed up ASAP.

It can cause tremendous damage as it continues

• Unplug from power ASAP
• Shut the Mac down ASAP
• Do not use ASAP
• Do not attempt to service a bulging Lithium ion battery your self

Get your Mac ready for service - Apple Support https://support.apple.com/en-us/HT209095

Learn how to get your Mac desktop or Mac notebook fixed and how much it will cost.

https://support.apple.com/mac/repair/service

Call Customer Support (800) MY–APPLE (800–692–7753)

or on line https://getsupport.apple.com/

or call AppleCare Support at 1-800-APLCARE (800-275-2273)

Outside the USA—Contact Apple for support and service by phone

See a list of Apple phone numbers around the world.

https://support.apple.com/en-us/HT201232