👉 Myelitis, a type of inflammation or infection caused by an immune system response to a foreign body, is characterized by inflammation in the lining of blood vessels. This condition can affect various organs and tissues in the body, including the heart, lungs, brain, and joints. In myelitis, the immune system mistakenly attacks healthy cells, leading to inflammation and tissue damage. The specific cause of this inflammation is not known but has been linked to a variety of factors such as infection or genetic mutations