Which is best treatment for hyperthyroidism? Why does it occur? I prefer natural foods to get this problem treated. Any suggestions?

all very pertinent questions.
Hyperthyroidism occurs due to the "effects of too much thyroid hormone on tissues of the body"

A complete list of causes is outlines at http://www.endocrineweb.com/hyper2.html
for treatment one can try
Anti-thyroid drugs
Radioactive iodine treatment
Surgery.
again all are explained in detail at http://www.endocrineweb.com/hyper4.html

another very informative site you can look at is http://curezone.com/dis/1.asp?C0=843
it lists foods, vegetables and fats that help in hyperthyroidism and also teaches about cleansing the body etc.
worth a read...

Thank you very much eco. I have visited all the three sites and found the information useful indeed.

i was curious about the radioactive iodine treatment...how much does it cost? which are the medical tourism countries that offer it? at what cost?