The same hormone that makes you love can also make you hate. How could Adolf Hitler have such love for children and animals, while murdering millions of people?. There are many reasons, and we are unlikely to ever really know. But there is one unusual suspect likely to have played a part.

Cuddling Releases Natural Painkillers

Oxytocin, the so-called love or cuddle hormone, is produced during an embrace or cuddle. Oxytocin is a hormone released by your posterior pituitary gland, the one you might remember from school bearing very close resemblance to a certain male appendage. Oxytocin has a couple of functions you might not have been aware of.  Oxytocin also lends a helping hand here. As the baby’s head hits its mother’s cervix, a rush of oxytocin releases. This causes the muscles within the birth canal to contract and push the baby out. 

Here comes the interesting role of oxytocin, the one you possibly already knew.

Oxytocin builds trust, love, and connection, and is aptly nicknamed the "bonding" hormone.

Oxytocin creates and reinforces bonds, playing a crucial role in the maternal bond between mother and child.

There’s more to it than that, though. When you give someone a long hug, you release oxytocin..

Oxytocin also creates and reinforces bonds.

If you know about bears, you’ll also know how protective they can be of their young. You might also be aware of how violent they can be, tearing apart any threat to their cubs. Both responses are reinforced by the very same hormone â€• oxytocin. 

Matching Hypothesis

Many psychological and social research indicates that there is a significant pattern in how people choose people to establish romantic relationships with. This pattern is explained by the Matching Hypothesis, which says that people are more attracted to those that they share a level of attractiveness with, or, in other words, are equally socially desirable. Even if successful couples differ in physical attractiveness, one of them usually compensates for it with other socially desirable qualities.

Broken Heart Syndrome

Research has provided evidence that intense, traumatizing events, such as a break-up, divorce, loss of a loved one, physical separation from a loved one, or betrayal can cause real physical pains in the area of one’s heart. This condition is called the Broken Heart Syndrome. Deep emotional distress triggers the brain to distribute certain chemicals that significantly weaken one’s heart, leading to strong chest pains and shortness of breath. The condition is often misdiagnosed as heart attack and tends to affect women more often.

The Jekyll and Hyde hormone.

An angel on one shoulder and a devil on the other. Unfortunately, our history's treatment of the "outsider" is far more fierce than a mother bear’s rage. 1941 to 1945, 6 million Jews were systematically killed, over two-thirds of the European Jewish population. 1994, up to 8 hundred thousand Tutsis were slaughtered, up to seventy percent of all Tutsis living in Uganda. 1975, between 1.3 and 3 million Cambodians were murdered between fifteen and thirty percent of Cambodia’s population. Different stories, same plot―eliminating the "outsider", and this tragic narrative is written by the same quill as love.

Sensation of Euphoria

Falling in love is much like taking a dose of cocaine, as both experiences affect the brain similarly and trigger a similar sensation of euphoria. Research found that falling in love produces several euphoria-inducing chemicals that stimulate 12 areas of the brain at the same time.