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 ...

Arthrosis is another term for osteoarthritis (OA), the most common form of arthritis. Both OA and rheumatoid arthritis affect bones, ligaments, and joints, but the difference between the two is ...

Christina Majaski writes and edits finance, credit cards, and travel content. She has 14+ years of experience with print and digital publications. Andy Smith is a Certified Financial Planner (CFP®), ...

Whether you live with bipolar disorder or major depressive disorder, you experience periods of depression. This can make it hard to tell them apart. But the bi-in bipolar means “two” because it has ...