What happens if graves' disease is not treated?

It varies: In some cases, the hyperthyroidism will get progressively worse and cause severe damage to the heart and other organs, and can even be fatal. Fortunately this is rare. More common are subtle effects on the brain causing irritability, poor concentration, poor judgment, and poor impulse control leading to trouble at work, and in getting along with others, including spouses and family members.

Ubtreated Graves: Untreated graves can lead to a bulgy appearance, drooping eyelid, blurred vision, blindness, extreme pain or sometimes rarely nothing. It is not a linear progression and sometimes can jump from red eyes to blindness without any middle ground.