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High “bad” LDL cholesterol usually does not cause symptoms, so most people do not know they have it until they are tested during a routine doctor’s visit. Very high levels may cause symptoms such as fatty bumps on your skin, called xanthomas, or grayish-white rings around the corneas in your eye, called corneal arcus. These mostly develop in people who have familial hypercholesterolemia. Undiagnosed or untreated high blood cholesterol can lead to serious problems, such as heart attack and stroke.

The surgery to connect the TAH is complex and can last from five to nine hours. Learn about the team that performs the surgery and the steps involved in connecting a TAH to your body.

You can take steps to prevent COPD before it starts. If you already have COPD, you can take steps to prevent complications and slow the progression of the disease.

Sickle cell disease is an inherited disease caused by defects, called mutations, in the beta globin gene that helps make hemoglobin.

Placing an implantable cardioverter defibrillator (ICD) requires minor surgery, which usually is done in a hospital. Typically, the ICD is placed under your breastbone or along your ribs. In infants, it can be placed in the abdomen. With some devices, your doctor may first thread one or two sensor wires through your blood vessels into the chambers of your heart. With others, a single sensor wire is placed along the breastbone. The doctors will use a monitor to guide the wires and put them in the right place.

Many people who have sarcoidosis have no signs or symptoms. Some people experience general signs and symptoms of sarcoidosis such as fatigue, fever, and weight loss. If inflammation continues, some people may develop permanent scarring, which can lead to life-threatening serious heart or lung complications.

There are three types of defibrillators: automated external defibrillators (AEDs), implantable cardioverter defibrillators (ICDs), and wearable cardioverter defibrillators (WCDs). Each type works by checking for arrhythmias, or irregular heart rhythms. Once detected, each defibrillator will send a shock to restore a normal rhythm. Learn more about how the three types of defibrillators work.

Automated external defibrillators AEDs are found in many public spaces. They may be used in an emergency to help someone who is experiencing sudden cardiac arrest.

Your doctor will diagnose deep vein thrombosis with or without pulmonary embolism based on your medical history, a physical exam, and various imaging or blood test results.

There are no methods to screen for VTE. If you are preparing to go to the hospital for a procedure or have other risk factors for VTE, talk with your doctor about a plan for preventing blood clots from forming.