Carla Tardi is a technical editor and digital content producer with 25+ years of experience at top-tier investment banks and money-management firms. Robert Kelly is managing director of XTS Energy LLC ...

Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. The average U.S. business cycle from 1854 to ...

Lower back spasms are involuntary contractions or tensing of the muscles in the lower back, and they may affect movement. Doctors may recommend medications, lifestyle changes, and complementary ...

Vaginismus makes vaginal penetration painful or impossible due to pelvic floor muscles involuntarily contracting. Primary vaginismus is lifelong, while secondary vaginismus develops after previously ...