The Physiology of Love

Most of us can look back at a time in our lives when we have felt “butterflies” in our stomach, or felt ourselves “falling” for someone. We may experience ourselves getting a bit obsessive, and some have described their feelings as “going crazy” for that person. Though these seem like just exaggerated words or phrases we have come to use, there seems to be some truth to these thoughts and behaviors.  Where are these sensations, obsessive thoughts, and often out of character behaviors coming from? How does our physiology actually change as we find that special person? 

According to neuroscientists, the process of falling in love is very similar to that of addiction. Romantic love releases neurotransmitters in the brain, just as it would if the person were experiencing a high. When you find yourself attracted to another person, or experiencing that chemistry or connection, you crave to be around them the way you would crave a drug. In this process, the neurotransmitter Dopamine, surges, creating a great feeling of euphoria when you are around that person, or even when you think about them. You’re then left craving that feeling again, or chasing that high. Simultaneously, Serotonin levels, which are associated with mood, begin to drop, leaving us desiring that person even more intensely.  Depletion of Serotonin is common in Depression, Obsessive- Compulsive Disorder, and Anxiety. Neuroscientists have found that these dropped levels of Serotonin occur among individuals who have recently fallen in love, and this depletion is responsible for the obsessive behaviors, and “crazy” feelings in the earlier stages of romantic love. In fact, a study by Dr Donatella Marazziti, a psychiatrist at the University of Pisa, showed that individuals who were deeply in love with their partners for six months, had the same levels of Serotonin as her patients who were suffering from Obsessive- Compulsive Disorder.

Our bodies also respond to romantic attraction with a strong release of Adrenaline and Cortisol. This release is also called the “Stress Response” since it makes our palms sweaty, and our hearts race.  The physiological impact of romantic love intensifies as we become more intimate with our partner. The hormone Oxytocin, which is released by both men and women during orgasm, deepens and strengthens the feelings of attachment to our partner. It is believed that the more a couple sleeps together, the stronger their bond becomes. Oxytocin is the same hormone that is released when a mother gives birth to her newborn, and is associated with the maternal attachment and bond with her child.

What then happens to these neurotransmitters and hormone responses when we have been with our partner for many years? While the process of falling in love leaves us feeling elated, obsessive, or even moody, being in an established committed relationship is associated with calm content feelings, and most often an absence of anxiety. The longer the relationship lasts, the less Dopamine, which we have mentioned is related to the high or euphoria of love, is released. A decrease in Dopamine does not however suggest a drop in romantic love for your partner. The molecule, CRF (corticotrophin-releasing factor) is released when we are away from our partners for too long. This molecule is associated with negative and unpleasant mood, and can lead to separation anxiety.

In The Nature of Romantic Love, researcher Helen Fisher, explains the physiological transition between falling in love, and building long term attachment.  The studies show that as love progresses, brain physiology is impacted. Neurotransmitters like Dopamine begin to drop, and neurons in the Limbic system become habituated to our surroundings. In other words, once you have seen your beloved regularly, that feeling of elation will subside after about two to three years. Simultaneously, our endorphin systems take hold, giving us feelings of tranquility, stability and safety in our relationships as they progress.

As neuroscientists continue to study the impact attraction, romantic love and attachment have on our physiology, it becomes clear that we don’t just love with our hearts and our minds, but in fact love is a full body experience that can actually alter who we are and how we function.




Golie Zarabi



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