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The feeling of being in love can not only have an effect on our brain, but it can also lead to changes in human physiology and behavior. According to scientists from around the world, each stage of love for another human may be driven by the release of different hormones. This cocktail of hormones released during each phase can influence the way that we think and behave and can have a positive effect on our well-being. The three stages include lust, attraction and attachment.



The first phase of falling in love is the lust or the desire phase. Lust is the craving for sexual satisfaction which is a feeling that evolved in humans to motivate union with a single partner. During this phase, men and women both release healthy amounts of testosterone and estrogen.

In females, estrogen plays a role in vaginal health, longing for physical closeness with a mate, and the desire for sex. In both male and females (but more so in men), testosterone drives sexual desire, openness and seductiveness.

Regardless of gender when these hormones are present at healthy levels, the reproductive system is regulated, energy levels increase, and sex drive is heightened. Pheromones, which are odorless chemicals produced by humans and detected by the nose of other humans, also play a role in the lust phase because they help to initiate the initial desire. During this phase, the primary objective is to have sex rather than form an emotional connection.


Scientists have found evidence that adrenaline, dopamine and serotonin are involved in the attraction phase.

Adrenaline is a hormone that is released during the human stress response and also plays a role in enhancing attraction and arousal of humans. This hormone causes the heart to beat faster and stronger, results in a surge of energy and focuses attention onto solely onto your potential mate. It can also heighten feelings of anxiety or nervousness and butterflies in the stomach.

Dopamine is a hormone that plays a role in motivation, addiction, attention and desire. Once released, this chemical messenger produces a feeling of happiness and bliss. Dopamine is also released in response to cocaine and sugar which are both incredibly addictive. During the lust phase, dopamine levels increase which may essentially lead to an addiction to the person that is desired. High levels of dopamine are also associated with norepinephrine which is another chemical messenger that increases excitement and focus on another individual.

Serotonin is a hormone which acts as a neurotransmitter and plays a role in maintaining mood balance, appetite, sleep, memory, sexual desire and sexual function. During the attraction phase, serotonin levels decrease which can result in sleeplessness. Low levels of serotonin have also been linked to individuals with Obsessive-Compulsive Disorder and may also be the reason why individuals in the attraction phase of love obsessively thinks about their potential partner. Even though this hormone decreases during the attraction phase, sex can cause serotonin levels to increase again

During this attraction phase one may experience a feeling of euphoria or exhilaration and a craving for union the other human that they desire. Since hormones associated with the stress response are released during the attraction phase, individuals also may experience physiological changes such as sleeplessness, increased energy, loss of appetite, or rapid heart rate and accelerated breathing. Often considered the “honeymoon phase” between two partners, this phase usually only lasts a few months or less before the attraction fades or the attachment phase takes over.


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