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The exact cause of asthma is unknown, and the causes may vary from person to person. However, asthma is often the result of a strong response of the immune system to an allergen in the environment.

Heart failure is more common in people age 65 or older, blacks, people who are overweight, and people who have had a heart attack. Children who have congenital heart defects also can develop heart failure.

La anemia por deficiencia de hierro puede ser leve a grave. Las personas con anemia por deficiencia de hierro leve o moderada pueden no presentar ningún signo o síntoma. Los signos y síntomas frecuentes de la anemia por deficiencia de hierro son, entre otros, piel pálida, fatiga y dificultad para respirar. Las complicaciones de la anemia por deficiencia de hierro abarcan problemas cardíacos, como la arritmia, y la depresión.

If you have been diagnosed with Marfan syndrome, it is important to follow your treatment plan, make healthy lifestyle changes, and get mental health support. Learn how to prevent or reduce complications in the future. If you are thinking about becoming pregnant, discuss the possible risks with your doctor.

The types of pleural disorders are pleural effusion, pleurisy, and pneumothorax. Pleural effusion is a buildup of fluid in the pleural space. Pleurisy is inflammation of the pleura. Pneumothorax occurs when air or other gas builds up in the pleural space and may cause part or all of the lung to collapse.

DASH is a flexible and balanced eating plan that helps create a heart-healthy eating style for life.

Your doctor will check your medical history, perform a physical exam, and do tests and procedures to diagnose cardiogenic shock. Tests are usually done after you have been admitted to a hospital for a possible heart attack or symptoms of shock. If the reason for the shock is that the heart is not pumping strongly enough, then the diagnosis is cardiogenic shock.

COPD, or chronic obstructive pulmonary disease, is a progressive disease that makes it hard to breathe. In the United States, the term COPD includes two main conditions—emphysema and chronic bronchitis.

After sudden cardiac arrest, surgery to implant an implantable cardioverter defibrillator (ICD), or a fitting for a wearable cardioverter defibrillator (WCD), you will need regular visits with your doctor to check your condition, the device, or any medicines you are taking. You can get an ID card with information about your device to keep with you. It can be helpful in an emergency, to show airport security, or for medical personnel who need to know more about your device. If you have an ICD, be aware of the signs of complications with your device.

If you have known risk factors for developing an aortic aneurysm, your doctor may recommend screening. To screen for an aortic aneurysm, your doctor may recommend an imaging study to look at and measure the aorta. An aneurysm can develop and grow without any symptoms until it ruptures or dissects—events that are both life-threatening. If the aneurysm is found early, treatment or surgery may slow its growth and prevent rupture or dissection.