My horse allways throws her head when I ride.

When I go riding where ever, I hate it when my horse bobs her head I think she's trying to loosen the reigns so she dosn't have to listen to me so when she does it I usually spin her in a circle and go on with the walk! Should I be doing this or is there something better I can do?

Well, first of all that is a bad habbit but I hate saying this and I am no expert so don't go out buying this just because I gave you advice, but have you ever considered a martingale headset thingee :shiver I mean isn't that what they are for but idk good luck with the situation :)

What kind of bit do you use? Does she do this whether you're riding with contact or on a loose rein? A picture or video would be really helpful in seeing exactly what she's doing and how you're responding to the behavior.

I agree. It might just be an annoying habit, but she could be saying please loosen up my reins and let me walk. If you do put her on a loose rein with no contact, does she run off? Does she ignore you? Is there a reason you ride with contact and not on a loose rein? Etc, etc, etc. A video would be great for us to help you and more information and details as well.

Of course you've had her teeth checked?

A few questions for the OP (yes, they are in a specific order):

1) have you had the horse's teeth floated within the last 6 months?

2) have you had the saddle fitted by a professional?

3) has the horse been checked over by a vet, chiropractor, or message therapist for any soreness?

4) what kind of bit are you riding in?

5) what seems to 'trigger' the behavior?

AFTER you do everything that was suggested above (teeth, tack and all that checked), I'd say just ignore it. My horse does it sometimes, but the trainer we bought her from, who gave me a few lessons just said to ignore it and when she sees it doesn't get her anywhere she'll stop. Of course, mine doesn't do it a lot, just at the start of the ride sometimes if she's antsy...if yours does it the ENTIRE time you're out, well...I can't say I've dealt with that before.

This could also be a sign of head shaking. Head shaking is rather a disease than bad behavior! Punishment won´t help.
It can be triggered by several factors: light, pain, stress, allergies...

Bobs or throws her head?

Just to assume that your tack fits properly and there are no physical problems, what breed of horse is she? Many horses will bob rhythmically at a walk, especially a gaited breed.

Typically, if a horse is trying to pull the reins away from you, she will stretch her neck and quickly jut her nose forward, not bob.

Whatever is going on, a description of your tack, more information on your horse (age, amount of training, how long you've had her, etc), amount of your experience, is this a new habit, etc.. As mentioned above, a video would be a real help.