What are the symptoms of high iron in blood?

None to many. This is usually diagnosed as hemachromatosis. It is a genetic disorder. If high enough and long enough, it can affect ones joints (pain), glandular organs, (decreased libido and diabetes), the heart (abnormal rhythms) and many other organs and symptoms. One may become "bronze colored", develop low thyroid levels and develop liver disease. It is treatable if caught early and treated aggressivel.