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The types of circadian rhythm disorders are advanced or delayed sleep-wake phase disorder, irregular or non–24-hour sleep-wake rhythm disorder, and shift work or jet lag disorder. The type you may have is based on your pattern of sleep and wakefulness.

The chemicals in tobacco smoke harm your blood cells. Smoking can also damage the function of the heart and the structure and function of blood vessels, leading to atherosclerosis and its complications (coronary heart disease, heart attack, heart failure, arrhythmia, peripheral artery disease, and stroke).

A heart attack happens when the flow of oxygen-rich blood to a section of heart muscle suddenly becomes blocked and the heart can’t get oxygen. If you think you or someone else may be having heart attack symptoms or a heart attack, call 9–1–1 for emergency medical care.

Un ataque cardíaco ocurre cuando se obstruye de repente el flujo de sangre rica en oxígeno que llega a una parte del músculo cardíaco y el corazón no puede obtener oxígeno. Si usted piensa que usted u otra persona está teniendo síntomas de un ataque cardíaco o un ataque cardíaco, llame al 9-1-1 para recibir atención médica de urgencia.

Pacemakers use low-energy electrical pulses to control the rate and rhythm of your heartbeat. Traditional pacemakers send the electrical pulses through wires, also known as leads. Wireless pacemakers are a newer kind of pacemaker without wires.

Hypersensitivity pneumonitis is caused by repeated exposure to environmental substances that cause inflammation in the lungs when inhaled. Substances include: bacteria, fungi or molds, proteins, or chemicals.

Mitral valve prolapse is a condition in which the flaps of the mitral valve are floppy, or prolapsed, which can prevent the seal from forming, which results in a backflow of blood in the left atrium as blood is pumped through the heart.

Atherosclerosis is the main cause of PAD. Plaque buildup in the arteries is called atherosclerosis. Atherosclerosis is a disease in which a waxy substance called plaque builds up on the inner lining of arteries. Plaque is made up of fat, cholesterol, fibrous tissue, and calcium. In PAD, plaque may reduce or fully block the flow of oxygen-rich blood through arteries to the body’s vital organs and the limbs.

Pneumonia occurs when certain bacterial, viral, and fungal infections cause inflammation in the air sacs, or alveoli, of the lungs. Some of the more common causes in the United States include Streptococcus pneumoniae or pneumococcus bacteria, the influenza or flu virus, and respiratory syncytial virus (RSV).

Your risk of pneumonia may be higher because of your age, environment, lifestyle habits, and other medical conditions.