Physicians do not categorize states of arteriovenous malformation (AVM) as it is not a progressive disease. The condition is congenital – occurring at birth – and continues through life unless treated. In many cases, symptoms never appear and the person leads a normal life unaware of the condition. However, an AVM can grow, creating pressure on surrounding areas of the brain, leading to headaches, dizziness and confusion. In addition, the AVM can reach a stage of development where it may burst.