The sun's distance from Earth changes throughout the year but it has nothing to do with the seasons. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it ...

Implantation occurs about 10 days after ovulation and marks the beginning of pregnancy. Signs you are in the implantation phase may include light bleeding, fatigue, and mild cramping. Tracking your ...

Chronic inflammation happens when your immune response stays active for months or years. This can quietly damage healthy tissues and organs over time. Common symptoms include fatigue, body pain, mood ...

Daniel Liberto is a journalist with over 10 years of experience working with publications such as the Financial Times, The Independent, and Investors Chronicle. David Kindness is a Certified Public ...

Sleep has two phases: non-rapid eye movement (NREM) and rapid eye movement (REM). It also has four stages that repeat in 4 to 6 cycles nightly. Each stage affects your body differently, from light ...

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 ...