What causes muscle spasms in the back of the head?

Hard to say. This could be coming from the back of your neck. The cervical muscles attach to the base of your skull so this may be the source of the spasms.

Related Questions

What causes painful muscle spasm in back of head?

Several things. It could be due to trauma, like whiplash injuries or heavy work. Neck degenerative arthritis can do this. Irritation of some of the small nerves to the neck muscles are a possibility. If it is not getting better, talk to your primary doctor or a specialist who takes care of neck problems. Read more...