Juvenile Arthritis Juvenile means the arthritis began before the age of 16 years old and arthritis is best defined as inflammation at a joint. The condition is 'idiopathic' meaning there is no known cause. We do know that Juvenile Arthritis is an autoimmune disease. This means your body is defending itself from injury, bacteria or infection by inflammation, a body's natural process, when there is no need to. Some research has centred towards the idea genetic predisposition which means there may be a combination of genes from both parents. There is no current evidence to show that Juvenile arthritis may be triggered by infection. To book an assessment or for more information please email office@manchesterneurophysio.co.uk call 0161 883 0066 . ← Previous Effects of juvenile arthritis Next → Error_log