Facts about love are not just poems and greeting cards. Researchers have scanned the brains of people in love, measured their hormones and tracked how couples change over time. This list has 15 interesting facts about love, each tied to a named study or source. It covers the psychology of love, what love does to the body and a few statistics about how Americans celebrate it.
Love stats at a glance
| Fact | Number | Source |
|---|---|---|
| Oxytocin in new couples vs singles | Nearly double | Bar-Ilan University, 2012 |
| Average years married in a long-term love brain study | 21.4 | Social Cognitive and Affective Neuroscience, 2012 |
| U.S. adults reporting loneliness | About 1 in 2 | U.S. Surgeon General, 2023 |
| Valentine's Day spending, 2026 | $29.1 billion | National Retail Federation |
| Americans buying Valentine's gifts for pets | 35% | National Retail Federation |
Psychology facts about love
1. Love lights up the brain's reward system
A 2005 study in the Journal of Neurophysiology scanned 17 people who were intensely in love. They looked at photos of their partners inside the scanner. The photos activated the ventral tegmental area and caudate nucleus, dopamine-rich areas tied to reward and motivation (PubMed).
2. Long-term love can look like new love
A 2012 study scanned 17 people married an average of 21.4 years who said they were still intensely in love. Their brains showed activity in the same reward areas seen in new couples (PubMed).
3. New love has something in common with OCD
In 1999, Donatella Marazziti and colleagues studied 20 people who had fallen in love in the past six months. They compared them with 20 people with obsessive-compulsive disorder and 20 controls. The in-love group and the OCD group both had lower levels of a serotonin transporter (Psychological Medicine).
4. New couples have nearly double the oxytocin
Researchers at Bar-Ilan University measured oxytocin in 60 new couples and 43 single people. The couples had levels close to double those of the singles (Live Science).
5. Oxytocin may hint at which couples last
In the same study, couples with higher oxytocin were more likely to still be together six months later.
6. A partner's photo can ease pain
Stanford researchers gave 15 students in the first nine months of a relationship mild heat pain while they looked at photos. Viewing a partner's photo reduced pain about as much as a distraction task, and more than an acquaintance's photo (ScienceDaily).
Physiological facts about love and heartbreak
7. A broken heart can be a real heart condition
Broken heart syndrome, also called takotsubo syndrome, can cause heart attack-like symptoms after intense stress such as a loss. It affects women far more often than men, and most people fully recover within about a month, according to Harvard Health Publishing (Harvard Health).
8. Even happy news can trigger it
In rare cases, broken heart syndrome follows a happy event. Up to 20% of cases have no clear trigger at all, Harvard Health reports.
Facts about relationships and loneliness
9. Loneliness is as risky as heavy smoking
The U.S. Surgeon General issued an advisory on loneliness in 2023. It said a lack of connection can raise the risk of early death to a level like smoking 15 cigarettes a day (NPR).
10. About half of U.S. adults feel lonely
Surgeon General Vivek Murthy said about 1 in 2 American adults report measurable levels of loneliness.
Fun facts about love and Valentine's Day
Facts 11 to 14 come from the National Retail Federation's 2026 survey of 7,791 adults (NRF).
11. Americans spent a record $29.1 billion on Valentine's Day
That was up from $27.5 billion in 2025. The average celebrant planned to spend $199.78.
12. Just over half of Americans celebrate
55% of U.S. adults planned to celebrate Valentine's Day in 2026.
13. Pets get Valentine's gifts too
35% of shoppers planned to buy a gift for a pet, worth $2.1 billion in total. 33% planned gifts for friends.
14. Candy is the top Valentine's gift
56% planned to buy candy. Flowers and greeting cards tied at 41%.
15. Love notes are centuries old
Formal Valentine messages appeared in the 1500s, and printed cards were in use by the late 1700s, according to Encyclopaedia Britannica (Britannica).
What these facts mean for your relationship
The research points to a simple idea: connection is good for you, and long-term love can stay strong. Small habits like a morning text, a photo on your desk or a regular date night keep that connection going.
For more on early love, read our signs that you're falling in love and good morning quotes about love. For a gift with your initials or anniversary date stitched on, browse our couple gifts and personalized embroidered gifts.
Frequently asked questions
What are some interesting facts about love?
Love activates the brain's reward system, new couples have nearly double the oxytocin of singles, and a partner's photo can ease pain.
What does psychology say about love?
Brain scans show romantic love uses reward and motivation areas rich in dopamine. Early love also shares a serotonin pattern with obsessive thinking.
Can love really last for decades?
Some couples show it can. People married an average of 21.4 years had brain activity in the same reward areas seen in new couples.
Can a breakup hurt your heart?
Yes. Intense stress can trigger broken heart syndrome, a temporary heart condition. Most people recover within about a month.
How much do Americans spend on Valentine's Day?
A record $29.1 billion in 2026, or about $199.78 per person, according to the National Retail Federation.
Why is loneliness bad for your health?
The U.S. Surgeon General says a lack of connection raises the risk of early death to a level similar to smoking 15 cigarettes a day.
