For an eternity we have been told we need shoes with better support - meaning we should get arch support orthotics. Before you spend hundreds of dollars on a custom set, you may want to read this article from the NY Times - Do You Really Need an $800 Custom Insole.
Dr. Benno Nigg of the Human Performance Laboratory, University of Calgary, Alberta, Canada, concludes that the idea that custom arch support orthotics are supposed to correct mechanical-alignment problems does not hold up. Click here to access the NY Times article.
If you do this quick three step assessment, you will understand the reason your foot mechanics is off, why it causes you pain and can lead to disability, and why arch support orthotics in most cases will not correct the problem.