Is Myocarditis contagious?

Myocarditis is not contagious and cannot be spread through person-to-person contact, such as touching, kissing, or sharing living spaces. While the initial trigger for myocarditis may occasionally be a viral infection, the inflammation of the heart muscle itself is an internal medical event, not an infectious disease that can be passed to others.

What causes myocarditis?

Myocarditis is an inflammatory condition of the heart muscle, most commonly triggered by an immune system overreaction. While viral infections (such as Coxsackie B, adenovirus, or SARS-CoV-2) are frequent triggers, the condition is the result of the body’s internal response to that pathogen, not the pathogen being transmitted from the patient to a bystander. Other non-infectious causes of myocarditis include autoimmune diseases (like lupus or sarcoidosis), reactions to certain medications, or exposure to environmental toxins.

Why is there confusion about the contagiousness of myocarditis?

The misconception that myocarditis is contagious stems from the fact that it is often diagnosed following a common viral illness. People may mistakenly conflate the initial, transmissible virus with the resulting, non-transmissible heart inflammation. It is vital to understand that once a patient develops myocarditis, they are not a source of infection for their family or caregivers.

What are the common triggers and factors?

Because the development of myocarditis is complex, it is helpful to understand the various ways the heart can become inflamed:

• Viral pathogens: Common viruses that trigger an immune response leading to heart inflammation.


• Autoimmune conditions: When the body mistakenly attacks its own healthy heart tissue.


• Systemic disease: Inflammatory conditions such as giant cell myocarditis or sarcoidosis.


• Environmental toxins: Exposure to heavy metals, certain snake venoms, or specific chemical agents.


• Medication hypersensitivity: Rare allergic reactions to certain antibiotics or vaccines that result in cardiac inflammation.

Next steps

• Consult a cardiologist to discuss your specific diagnostic results and treatment plan.


• Connect with the 11 members of our DiseaseMaps.org community who are living with myocarditis to share experiences and reduce feelings of isolation.


• Follow your physician’s guidance regarding activity restrictions while your heart muscle recovers.

Medical disclaimer: This content is for educational purposes only and does not replace professional medical advice, diagnosis, or treatment.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Myocarditis Overview.


• American Heart Association (AHA): Understanding Myocarditis.


• Orphanet: Rare inflammatory heart diseases.


• Myocarditis Foundation: Patient Education and Resources.