Hi @linda59, and welcome to Connect. I’m sorry to hear that your son’s disease has returned. Giant cell myocarditis (GCM) is a rare cardiovascular disorder that occurs for unknown reasons (idiopathic). It is characterized by inflammation of the heart muscle (myocardium), a condition referred to as myocarditis.
I’ve included some links to more information on myocarditis, which includes treatment options, lifestyle and home remedies (http://www.mayoclinic.org/diseases-conditions/myocarditis/basics/definition/con-20027303).
How have you and your son been managing his GCM thus far?