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Sleep apnea can be caused by a person’s physical structure or medical conditions. These include obesity, large tonsils, endocrine disorders, neuromuscular disorders, heart or kidney failure, certain genetic syndromes, and premature birth.

Signs and symptoms vary between acute, subacute, and chronic hypersensitivity pneumonitis and may include flu-like illness including fever, chills, muscle or joint pain, or headaches; rales; cough; chronic bronchitis; shortness of breath; anorexia or weight loss; fatigue; fibrosis of the lungs; or clubbing of fingers or toes. Complications of chronic disease may include irreversible lung damage, permanently reduced lung function, pulmonary hypotension, or heart failure.

There are many risk factors for sleep apnea. Some risk factors, such as unhealthy lifestyle habits and environments, can be changed. Other risk factors, such as age, family history and genetics, race and ethnicity, and sex, cannot be changed.

You may have an increased risk of arrhythmia because of your age, environment, family history and genetics, habits in your daily life, certain medical conditions, race or ethnicity, sex, or surgery.

Heart inflammation can be caused by infections, particularly from viruses or bacteria; medicines; or damage to the heart’s tissue or muscle from autoimmune diseases, medicines, environmental factors, or other triggers.

Signs and symptoms vary based on the type of angina you have and on whether you are a man or a woman. Angina symptoms can differ in severity, location in the body, timing, and how much relief you may feel with rest or medicines. Since symptoms of angina and of heart attack can be the same, call 9-1-1 if you feel chest discomfort that does not go away with rest or medicine. Angina can also lead to a heart attack and other complications that can be life-threatening.

There are three main types of coronary heart disease: obstructive coronary artery disease, nonobstructive coronary artery disease, and coronary microvascular disease. Coronary artery disease affects the large arteries on the surface of the heart. Many people have both obstructive and nonobstructive forms of this disease. Coronary microvascular disease affects the tiny arteries in the heart muscle.

Age, family history and genetics, lifestyle, heart disease or other medical conditions, race, sex, and a history of surgery can all raise your risk of developing the structural and electrical anomalies that cause atrial fibrillation. Even in a healthy heart, a fast or slow heart rate—from exercising or sleeping, for example—can trigger atrial fibrillation.

Your doctor may recommend healthy lifestyle changes, medicines, or other treatments aimed at keeping your symptoms from getting worse, increasing your ability to exercise, improving heart function, and ensuring a better quality of life. There is no cure for pulmonary hypertension unless chronic blood clots in the lungs are the cause.

Defibrillators can be used in children, teens, and adults. AEDs are used to treat sudden cardiac arrest. Your doctor may recommend an ICD or WCD to treat an arrhythmia and prevent new or repeat sudden cardiac arrests.