You remember the story of Jesus healing the woman with the flow of blood? The story begins with him feeling an energy drain when she touched him. An anemic woman would naturally be low in vital energy.
There is an entire school of thought that energy flows like electricity. From higher to lower, stronger to weaker etc.
The example above is just one most of us are familiar with. Many secular and other religious resources report similar stories.
So what if the question is not "does it exist" (energy moving from one source to another)
but "what is the source"?
I personally think it is a simple part of the natural world. Just like barometric pressure and tides and so on.
Some people seem to have more energy naturally, just like some people can sing or excel at math or art. IF they have this abundance of energy and IF they are aware of it, then what is the harm if that energy is transferred in a way that creates extra blood flow (healing) to someones wrist?
The idea that there are unseen forces that can tap in to this and use it to manipulate humans is really a separate topic in my opinion.
The world has always had healers. That is the plain and simple of it. Many times it gets tied to religion like many other things that cant be explained.
That doesnt mean it should be though, in the interest of accuracy.
There is also the placebo effect that OrphanCrow mentioned above. Papers have been written on many cures effected this way. The brain is a powerful thing, as is our natural world that we have such limited knowledge of.
I think you can relax and enjoy your wrist feeling better with no side effects! Hooray!
