It can start with unusual discomfort or breathlessness during a workout or an uphill walk—a feeling many of us experience, and dismiss, the older we get. But medical researchers are learning more ...

Bradycardia does not often cause symptoms. If symptoms of bradycardia do occur, they may include fatigue, lightheadedness, and exercise intolerance. A slow heart rate in young people or athletes or ...

Medically reviewed by Leigh Weddle, PharmD Creatine commonly causes weight gain because it pulls water into your ...

A new study suggests preload deficiency could be the underlying cause of fatigue and exercise intolerance in people with systemic lupus erythematosus (SLE). Preload deficiency is a condition where the ...