Pain comes in different flavours and different levels, pain caused by either emotional or physical distress.
I find physical pain much easier to deal with than mental or emotional pain. A broken bone gets a cast, which makes it obvious for friends, family and other spectators that something is amiss.
There's no cast for emotional pain, so it's lacking the helpful visual a broken bone has. It's just as overwhelming as physical pain but it takes a lot more effort to manage.