Sick sinus syndrome (SSS) is a heart rhythm problem that affects your heart's natural pacemaker. You may develop symptoms of SSS like dizziness, fainting, and fatigue. Treatment may include lifestyle ...

Stiff person syndrome (SPS) causes you to have muscle stiffness and spasms, often triggered by sudden noises or touch. You can use medications like muscle relaxants and anticonvulsants to relieve ...

With more than 15 years of experience crafting content about all aspects of personal finance, Michael Benninger knows how to identify smart moves for your money. His work has been published by Intuit, ...

Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Robert Kelly is managing director of XTS ...

What Is Key Rate Duration? Key rate duration is a measure of bond price sensitivity to changes at different points along the yield curve. As opposed to effective duration, which looks at changes in ...