... or irrefutable evidence of an unhealthy team.
Can your team do an iteration retrospective with a minimum of venom and squirming? Is everybody unafraid to speak up in a retrospective? Can you calmly talk about what's not going well and what is without retribution?
If you can answer these questions in the affirmative, you just might be a healthy team. If you answer no, or if you have, let's say, regularly scheduled mandatory team building meetings, you might need a checkup.