Of the 100+autoimmune diseases, a handful are potentially fatal.
In this disease, there is inflammation in the heart muscle (myocardium).
Initial symptoms can include:
Irregular heartbeats (arrhythmias) can cause light-headedness or loss of consciousness.

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It is a rare disease with roughly 300 cases recorded in the literature.
There is no proven cure for giant cell myocarditis.
The antibodies interrupt signaling and cause swelling in the brain, also referred to asencephalitis.
The disease mainly affects young people and is more common in women.
Anti-NMDA receptor encephalitis can cause a variety of symptoms.
Its estimated that roughly 6% of people will die from anti-NMDA receptor encephalitis.
It is most common in women under 30.
Over-the-counter remedies can help with pain in the joints and inflammation of muscles.
glucocorticoids may be given if complications occur, or during disease flares.
Some people experiencing MCTD will require long-term immunosuppressants.
Generally speaking, the long-term outlook for those living with MCTD is good.
However, this varies based on the symptoms present.
Some people will have symptom-free periods that can stretch for years and not require treatment.
Vasculitis causes narrowing and inflammation of the blood vessels, which comprise the arteries, veins, and capillaries.
The blood vessels are responsible for carrying blood between the heart and other organs in the body.
Vasculitis can occur in isolation or alongsiderheumatoid arthritis,lupus, or Sjogren’s syndrome.
Signs and symptoms vary and are dependent on the organs involved and the severity of the condition.
Symptoms specific to certain organs throughout the body can include the following.
In severe cases, the disease causes blood vessels to shut, so blood cant pass through.
This can result in stenosis (blockage).
At its severe stage, vasculitis can cause organ damage and death.
Treatment options vary based on the severity of the disease and the organs affected.
Those who have severe vasculitis receive corticosteroids like prednisolone in an attempt to reduce inflammation in the blood vessels.
Other immunosuppressive drugs are often used in combination with steroid therapy.
Are Autoimmune Disease More Prevalent in Women?
There are over 100 types of autoimmune diseases that predominantly affect women.
Approximately 80% of all people diagnosed with autoimmune diseases are women.
American Autoimmune Related Diseases Association.Giant cell myocarditis.
National Organization For Rare Disorders.Giant cell myocarditis.
Penn Medicine.Could your loved one have autoimmune encephalitis?Updated June 13, 2016.
National Center For Advancing Translational Sciences.Mixed connective tissue disease.
2009;33(1):12-16. doi:10.1016/j.jaut.2009.03.005