Myocarditis is inflammation of the heart muscle. It is a rare disease and can be caused by several factors: infections, allergic reactions, diseases with an immunological basis, etc. In some patients, there are no symptoms, but in most the disease is manifested by chest pain, fatigue, fever, joint pain, or shortness of breath, among other symptoms. For diagnosis, it is necessary to perform a series of tests (general analytic, an ultrasound of the heart and an electrocardiogram), and treatment aims to eradicate what caused the inflammation of the heart muscle by prescribing antibiotics or anti-inflammatory and recommendation salt diet or decreased physical activity. In many cases, recovery with proper treatment may involve the complete cure of the patient, preventing further complications such as heart failure.