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Whether your favorite summer activity is taking a long hike on a trail, catching waves at the beach or having fun at a backyard barbecue, the warmer temperatures generally mean more time spent outdoors in the sun. But because more exposure to sunlight means more exposure to the sun’s ultraviolet A and B rays, you need to take steps to protect yourself from cancer-causing ultraviolet radiation.

What is the difference between cardiovascular disease and heart disease?

These two terms are often used interchangeably, but there is a difference. Cardiovascular disease is an umbrella term that encompasses several heart conditions, including heart disease, coronary heart disease, stroke, heart failure and peripheral artery disease.

In a surgical suite at Barnes-Jewish Hospital, a robotic arm snakes an ultra-thin, ultra-flexible tube through a patient’s airway. Once the tube reaches the lungs, the surgeon operating the device remotely uses a tiny camera to search the area for an abnormal growth, or nodule, that might be cancerous. Once located, a needle pierces the nodule for biopsy.

At least 2.7 million Americans have atrial fibrillation, or a-fib, the most common kind of irregular heartbeat, also known as arrhythmia. A-fib is caused when the heart’s upper chambers beat erratically or quiver and don’t sync with the heart’s lower chambers. Learn more about how a-fib occurs.