When most people think about cannabis and pain relief, they think about THC — the compound responsible for cannabis’s psychoactive effects, and the one most associated with its medicinal reputation. New research from the University of Arizona suggests the real story may lie somewhere else entirely: in the compounds responsible for cannabis’s smell.
What Are Terpenes?
Terpenes are natural compounds responsible for the scent and flavor of countless plants — not just cannabis, but pine trees, citrus fruits, lavender, and many others. In cannabis specifically, terpenes contribute to the plant’s distinctive aroma, and growing research suggests they may also carry genuine medicinal properties of their own.
Critically, unlike THC, terpenes do not produce psychoactive effects. They won’t get you high. That single distinction makes them an unusually appealing area of research for scientists hunting for new pain treatments — the potential therapeutic benefits of cannabis, without the intoxicating side effects that limit its use in many clinical and everyday settings.
Building On Earlier Discoveries
The new study, published in Pharmacological Reports, builds directly on earlier research from the lab of John Streicher, PhD, a member of the University of Arizona’s Comprehensive Center for Pain & Addiction. Streicher’s previous work had already shown that cannabis terpenes could reduce pain in models of inflammation and chemotherapy-related nerve damage.
This new study pushed the research into two conditions that hadn’t been studied before in this context: fibromyalgia and post-operative pain.
A Digital Program Could Prevent Falls In Older Adults — But Real-World Testing Revealed The Gap Between Research And Practice
“Our research is showing that terpenes are not a good option for reducing acute pain resulting from an injury, such as stubbing your toe or touching a hot stove; however, we are seeing significant reductions in pain when terpenes are used for chronic or pathological pain,” said Streicher, professor in the U of A College of Medicine — Tucson’s Department of Pharmacology. “This study was the first to investigate the impact of terpenes in preclinical models of fibromyalgia and post-operative pain and expand the scope of potential pain-relieving treatments using terpenes.”
Four Terpenes, Strong Results
Researchers examined four terpenes commonly found in Cannabis sativa: geraniol, linalool, beta-caryophyllene, and alpha-humulene. In mouse models of both fibromyalgia and post-operative pain, all four compounds produced substantial pain-relieving effects.
Geraniol delivered the strongest results of the four, followed by linalool, beta-caryophyllene, and alpha-humulene in descending order of effectiveness.
Why Fibromyalgia Treatment Matters So Much
Fibromyalgia remains one of the most genuinely difficult chronic pain conditions in medicine. It affects muscles and soft tissue throughout the body, and according to research published in Healthcare (Basel) in 2023, it impacts up to 5 percent of the global population. In the United States alone, roughly 4 million adults live with fibromyalgia, according to the U.S. Department of Health and Human Services’ Office on Women’s Health — and women are affected considerably more often than men.
The challenge with fibromyalgia isn’t just treating it — it’s understanding it in the first place. “With fibromyalgia, there isn’t much understanding of what the pain state is, and there are not a lot of great options for treating it,” Streicher said. “Our findings show that terpenes may be a viable treatment option for fibromyalgia pain, which could potentially have a large impact and make a difference for an under-treated population.”
A New Option For Post-Surgical Pain
The researchers also investigated whether terpenes could help with pain following surgery — a category of pain that occupies an unusual middle ground. It’s typically temporary, but surgery itself triggers inflammation and heightened pain sensitivity that can make recovery genuinely difficult to manage.
Current post-surgical pain management relies heavily on opioids, which are effective but carry real risks. “Opioids do a good job controlling post-surgical pain, but they can cause constipation that can increase the chances of post-surgical complications such as adhesions,” Streicher explained. “We are always looking for better options, and this study suggests that terpenes could be a novel therapeutic for post-operative pain.”
Given that an estimated 310 million major surgical procedures are performed worldwide each year, according to a 2020 study in the International Journal of Surgery, even a modest improvement in post-surgical pain management options could have an enormous cumulative impact.
The Bigger Picture: Nature’s Untapped Pharmacy
Todd Vanderah, PhD, director of the Comprehensive Center for Pain & Addiction and head of the Department of Pharmacology, sees this research as part of a much larger story about the untapped potential of natural compounds.
“The research that is being done by Dr. Streicher’s lab on terpenes and their potential to help those who suffer from chronic pain demonstrates the importance of basic research. There are hundreds of unique chemicals that plants make, including the Cannabis plant, that are undiscovered,” Vanderah said.
He pointed to a striking parallel example. “Nature is incredible at making unique chemical structures, and many of these chemicals are unknowns when it comes to their abilities to aid in human health, diseases and disorders. A great current example is medication semaglutide, sold under the brand name Ozempic, which has a chemical structure that was isolated not from a plant, but from an animal that is prevalent in the Southwest, the Gila monster. These discoveries from natural products through research such as Dr. Streicher’s can result in very useful medications.”
How The Terpenes Actually Work
The researchers also identified the biological mechanism behind the pain relief. The effects were linked to the adenosine A2a receptor — notably, the same receptor that caffeine targets and blocks. This connection suggests terpenes may also carry sedative properties, something the researchers say warrants further investigation in future studies.
What This Means Going Forward
This research remains at the preclinical stage — these findings come from mouse models, and human clinical trials will be necessary before terpenes could become an approved pain treatment. But the consistency of the results across multiple terpenes and multiple chronic pain conditions makes a compelling case for continued investigation.
For the millions of people living with fibromyalgia and the hundreds of millions undergoing surgery each year, a non-psychoactive, plant-derived pain relief option could represent a genuinely meaningful addition to the limited toolkit currently available. 🌿💊
Source: University of Arizona Health Sciences / Pharmacological Reports — June 20, 2026
Journal Reference: Caleb A. Seekins, Alyssa M. Welborn, Abigail M. Schwarz, John M. Streicher. Select terpenes from Cannabis sativa are antinociceptive in mouse models of post-operative pain and fibromyalgia via adenosine A2a receptors. Pharmacological Reports, 2024; 77 (1): 172.
DOI: 10.1007/s43440-024-00687-1
