Hormones control all bodily processes in humans because they affect everything from metabolism and mood through reproduction and sleep. However, one of the most important yet often misunderstood ...

Brain cells (magenta) in the reward center of a rat’s brain release dopamine in response to opioids. According to a new study by WashU Medicine researchers, male and female rats with a chronic pain ...

Scientists used rigorous methods to track 24 young women’s cycle phases and hormones while they trained for several months.