Atrial fibrillation - Symptoms and causes - Mayo Clinic Atrial fibrillation (AFib) is a heart rhythm disorder In a typical heart, a group of cells called the sinus node sends electrical signals that start each heartbeat The signals go across the upper heart chambers to the AV node, where they usually slow down Then the signals go to the lower heart chambers, causing them to squeeze and pump out blood But in AFib, the signals in the upper
HDL cholesterol: How to boost your good cholesterol HDL cholesterol levels are often lower in people who have metabolic syndrome This is a group of conditions that includes obesity, increased blood pressure and high blood sugar levels Increased physical activity can raise HDL cholesterol levels while lowering levels of triglycerides, the most common type of fat in the body As little as 60 minutes of moderate-intensity aerobic exercise a week
Narcissistic personality disorder - Symptoms and causes A narcissistic personality disorder causes problems in many areas of life, such as relationships, work, school or financial matters People with narcissistic personality disorder may be generally unhappy and disappointed when they're not given the special favors or admiration that they believe they deserve They may find their relationships troubled and unfulfilling, and other people may not
Whooping cough - Symptoms causes - Mayo Clinic Whooping cough is an illness that can spread easily It's also called pertussis An infection with bacteria causes it Many people with the illness get a serious hacking cough Breathing in after coughing often causes a high-pitched noise that sounds like a "whoop " Before the vaccine for pertussis came out, whooping cough was thought of as a childhood disease Today, whooping cough mainly
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