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Marfan syndrome is a rare genetic disorder. It affects the body's connective tissue.

Huntington disease is a brain disorder that can lead to emotional disturbances, loss of intellectual abilities, and uncontrolled movements.

Parkinson disease is a movement disorder that can cause muscles to tighten and become rigid. It can make it hard to walk and engage in daily activities.

Arrhythmogenic right ventricular cardiomyopathy (ARVC) is a disease of the heart muscle. In this disease, fatty fibrous tissue replaces normal heart muscle. This interrupts normal electrical signals in the heart and may cause irregular and potentially life-threatening heart rhythms. The heart also becomes weaker over time leading to heart failure.

Bacterial endocarditis is a bacterial infection of the inner layer of the heart or the heart valves. Read on to learn about the cause, symptoms, diagnosis, and treatment.

Peripheral neuropathy is a type of damage to the nervous system.

Behcet disease is a type of autoimmune disease. It causes inflammation of blood vessels. It’s a rare disease in the United States, but it is more common in the Middle East and Asia. It’s more common in people in their 20s to 40s, but it can happen at any age.

Cushing syndrome is a hormonal disorder. It’s caused when you have high levels of the hormone cortisol over a long time. Cushing's syndrome is fairly rare. It most often affects adults who are 20 to 50 years old. It is sometimes called hypercortisolism.

Hypertrophic cardiomyopathy (HCM) is a disease that causes thickening (hypertrophy) of the heart muscle. The heart cells enlarge more than they should, and scarring is often found between the cells.