When a horse moves their head from side to side continuously, the horse is trying to express a thought or feeling. I saw this behavior in our stallion when he wanted to go outside. It was the only time he made this motion, and it trained us to let him out. Very effective. Other horses make this same motion when they want to come in. The motion is to get our attention, like waving a hand.
Sometimes the weaving causes the horse to lift a foreleg just from the momentum of the head movement. This causes the ground underneath the hooves to indent the material. This is evidence of potential trauma to the skeletal system.
I also believe there is some anxiety that would be alleviated with a change away from inflammatory foods.
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