10 unnerving facts about human aggression have been uncovered by modern science, shedding light on why we sometimes resort to violence. What are the causes of violence? Why does it exist in the world? This article unpacks the latest research, from prehistoric battles to the tiny genes that may nudge us toward aggression.

10 Unnerving Facts About Human Violence

1 Genes

Scientists have pinpointed a duo of so‑called “human warrior genes” that appear to boost a person’s propensity for violent acts. These genetic variants are also linked to risky decision‑making, especially when alcohol is involved. Intriguingly, the mutations show up only in men and are especially prevalent among heavy‑drinking individuals who commit crimes while intoxicated.

The two genes in question—MAOA and CDH₁₃—were highlighted in a Finnish study involving over 900 convicted offenders. Researchers discovered that childhood maltreatment did not significantly raise violent tendencies among carriers of these genes, whereas substance abuse did.

In other words, the genetic predisposition seems to lie dormant unless triggered by external factors like drug or alcohol use. The study also noted that these genes influence broader risky behaviors, not just aggression.

While the findings point to a genetic component, they also underscore the importance of environment. The interplay between biology and surroundings suggests that future interventions could target both genetic risk and harmful habits, offering hope for reducing violent outcomes.

2 Testosterone

Although violence is not exclusively a male trait, testosterone plays a pivotal role in shaping aggressive tendencies. Even our closest primate relatives, such as male chimpanzees, display fierce, testosterone‑driven battles.

Across many primate species, males engage in fights, form coalitions, and exert dominance—all behaviors linked to elevated testosterone levels. It’s crucial to note that testosterone fuels not only outright aggression but also competitive drives, ambition, and the pursuit of status.

The hormone’s influence on status‑seeking can indirectly encourage violent actions, especially when individuals associate power with physical dominance. However, testosterone also promotes non‑violent traits like perseverance and strategic planning.

Thus, testosterone’s relationship with violence is indirect: it amplifies the desire for prestige, which can sometimes manifest as aggression, but it does not guarantee violent behavior.

3 War

Beyond personal aggression, humanity also exhibits large‑scale violence in the form of war. Traditional evolutionary narratives emphasize “survival of the fittest,” but sexual selection adds another layer.

While war can diminish individual survival odds, it can markedly boost social status and mating opportunities. Individuals who gain honor, prestige, and a strong reputation often enjoy enhanced access to potential partners.

This status‑driven motive helps explain why people might willingly risk death in combat: the promise of elevated standing and the associated reproductive benefits can outweigh the immediate dangers.

Consequently, war can be seen as a collective expression of the same status‑seeking impulses that drive individual aggression, intertwining sexual selection with lethal conflict.

4 Accidents

Evolutionary theories sometimes paint humanity as a fundamentally violent species, but the reality is more nuanced. Certain genetic traits that predispose people to aggression can also lead to unintended violent outbursts.

In many cases, violence emerges as an accidental by‑product of genes selected for entirely different, non‑aggressive functions. These “wiring kinks” can misfire under specific circumstances, causing harmful behavior.

Thus, while humans are not inherently brutal, occasional genetic quirks can produce violent episodes that are not directly tied to survival or reproduction.

Understanding these accidental pathways highlights the importance of context: external pressures or triggers can tip the balance, turning latent predispositions into actual aggression.

5 Heritability

Research estimates that roughly half of antisocial and aggressive tendencies are heritable. Twin studies—especially those involving identical twins—show that genetics account for about 50 % of violent behavior.

Identical twins share 100 % of their DNA, while fraternal twins share about 50 %. By comparing outcomes across these groups, scientists can tease apart genetic influence from environmental factors.

Even when identical twins are raised apart, differences in upbringing can lead to divergent levels of aggression, underscoring the significant role of nurture alongside nature.

These findings illustrate that while a substantial genetic component exists, the environment can amplify or mitigate inherent predispositions.

6 Nature

For decades, scholars debated whether violence stemmed primarily from cultural influences or hard‑wired biology. Modern research now suggests a blended view: humans carry a latent propensity for aggression, but external pressures shape its expression.

Studies indicate an almost even split—about 50 % genetics, 50 % environment—in determining violent behavior. This balance highlights the importance of both innate predispositions and situational triggers.

Consequently, while no single gene dictates aggression, a combination of genetic factors and life experiences determines how, when, and whether violence manifests.

The nuanced picture encourages interventions that address both biological vulnerabilities and environmental stressors.

7 Violence And Sex

The brain’s reward circuitry links violent impulses with sexual motivation. When mating opportunities feel threatened, individuals may experience heightened aggression, a response rooted in evolutionary strategy.

Research shows that jealousy and perceived threats to reproductive success can trigger violent outbursts, reinforcing the connection between sexual competition and aggression.

This interplay helps explain disturbing phenomena such as domestic abuse and sexual violence, where the underlying driver is often a perceived challenge to one’s mating prospects.

Understanding this link offers a pathway to addressing sexual aggression by targeting the underlying evolutionary pressures that fuel it.

8 Reward

Violent acts can trigger a surge of pleasure‑related chemicals in the brain, similar to the high experienced during intense competition or thrill‑seeking activities.

Studies reveal that both direct violence and the mere fantasy of aggression activate reward pathways, releasing dopamine and other neurotransmitters that reinforce the behavior.

Even individuals with psychopathic traits appear to derive internal gratification from violent thoughts or deeds, suggesting a hard‑wired neural reward for aggression.

While the intensity of this reward varies among people, the underlying neurochemical mechanisms demonstrate that our brains can indeed find violence rewarding.

9 Variability

Evolutionary psychology posits that the likelihood of violent behavior fluctuates across individuals based on biological and environmental cues.

When core survival or reproductive goals feel jeopardized, a person’s propensity for aggression rises. The more threatened these essential drives appear, the higher the chance of violent responses.

Thus, aggression is not a universal constant; it varies according to personal circumstances, genetic makeup, and perceived threats.

10 The First Violence

Archaeological evidence shows that warfare dates back to prehistoric times, indicating that violence has deep evolutionary roots. Mass graves and skeletal remains reveal that early humans engaged in lethal conflict long before recorded history.

Evolutionary psychologists argue that violence is neither a universal norm nor a rare exception but a latent potential within every individual, activated under particular environmental pressures.

Human societies have historically navigated a hierarchy of conflict resolution: from non‑verbal cues to discussion, warnings, and, as a last resort, physical aggression. This tiered approach reflects the costly nature of violence compared to more peaceful alternatives.

Most people experience violence only sporadically, typically when their social standing feels threatened. Only a small minority—such as serial killers—exhibit chronic, extreme aggression.

If you’ve ever wondered what makes trigeminal neuralgia (TN, often dubbed the “suicide disease”) so terrifying, you’re in the right place. Below are 10 unnerving facts that lay bare the worst‑pain‑known‑to‑man, its eerie past, bewildering triggers, and the fight for relief.

10 Unnerving Facts at a Glance

10 A Long History

Early physicians were already scratching their heads over a baffling form of facial torture that modern scholars label “tortura oris.” Greek healers Galen and Aretaeus of Cappadocia mentioned such agony in the first century, and Avicenna revisited the mystery in the 11th century. Even Hippocrates noted the perplexing pain in his seminal writings.

Fast‑forward to 13th‑century England, where the tomb of Bishop Button in Somerset bears eerie stone carvings of figures clutching their throats in distress. Researchers interpret these as early visual clues to what we now recognize as trigeminal neuralgia, rather than simple toothaches.

When Bishop Button’s remains were later exhumed, his teeth turned out to be remarkably intact—yet pilgrims still flocked to his shrine, hoping the saint could cure their jaw‑related woes. The legend persisted, blurring the line between dental pain and nerve‑driven torment.

The condition finally entered mainstream medical discourse when the English philosopher‑physician John Locke described its symptoms in 1677. By 1756, French physician Nicolas André coined the clinical term “tic douloureux.” Shortly thereafter, John Fothergill published a comprehensive account, dubbing it “Fothergill’s disease.”

Fothergill’s breakthrough was to classify the ailment as neurological, not dental. Modern neurology now calls it trigeminal neuralgia, referencing the fifth cranial nerve—the trigeminal nerve—whose dysfunction produces the searing facial pain.

9 A Disease Of Many Names

The nickname that sends shivers down spines is the “suicide disease.” When newly diagnosed patients hear this label, the shock is palpable, yet it captures the sheer gravity of the suffering.

Trigeminal neuralgia is infamous for delivering the most excruciating pain known to humanity. Only in recent decades have clinicians begun to develop truly effective therapies to tame its fury.

Popular myth once claimed that over half of those afflicted chose to end their lives. In reality, rigorous studies have found no solid evidence to back that alarming statistic, offering a small measure of solace to patients and families.

Beyond the grim nickname, the disorder carries a slew of alternative titles: tic douloureux, Fothergill’s disease, prosoplasia, and trifacial neuralgia. Most sufferers and their doctors simply abbreviate it to “TN.”

8 Trigger‑Happy Pain

What sets off the electric‑like jolts of TN? The short answer: almost everything. From a bright smile to a gentle breeze, the nerve seems primed to react.

Patients report a staggering roster of triggers: smiling, touching the face, brushing teeth, combing hair, wind gusts, eating, drinking, sudden temperature shifts, shaving, applying makeup, certain foods, loud noises, and even kissing. The sheer variety makes daily life feel like walking on a minefield.

The anticipation of a trigger can be just as debilitating as the pain itself, causing many sufferers to withdraw from routine activities for fear of an unexpected flare‑up.

7 The Dental Connection

“Yank ’em all out!” is the rallying cry of many newly diagnosed TN patients who, mistaking nerve pain for a stubborn toothache, rush to the dentist demanding extractions.

Like the medieval shrine to Bishop Button, modern sufferers often believe the source of their agony lies in a rogue tooth. In reality, the pain radiates from the trigeminal nerve, not the dentition, leading many to undergo unnecessary dental work.

Frustration mounts when patients endure multiple extractions, only to discover the pain persists, sometimes culminating in a full set of dentures before age 50. Veteran TN patients frequently share this cautionary tale with newcomers.

Still, the dental link isn’t entirely a red herring. Research shows that dental trauma—whether accidental or iatrogenic—accounts for roughly 40 % of trigeminal neuralgia cases. Combined with routine dental procedures that act as triggers, this creates a perfect storm of facial pain.

Thus, while not every toothache signals TN, dental professionals must stay vigilant, and patients should be aware that a dentist unfamiliar with the condition might inadvertently exacerbate the problem.

6 Treating The Incurable

Given its centuries‑long saga, it’s astonishing that truly viable treatments for trigeminal neuralgia have only emerged in the past hundred years. Once researchers pinpointed its neurological roots, a wave of medical interventions followed.

Traditional analgesics—NSAIDs and opioids—prove largely ineffective because the pain originates from a nerve, not inflammation. Instead, anticonvulsants such as gabapentin and Trileptal serve as first‑line therapy, delivering relief in about 80 % of cases.

These drugs, however, bring a host of side‑effects, and many patients find they must gradually increase dosages to sustain efficacy. Adjunct medications like Lamictal and Baclofen are sometimes added to bolster the anticonvulsant effect.

When pharmacology falls short, surgeons step in. The most prevalent operation is microvascular decompression (MVD), a technique pioneered by Walter Dandy in 1925. MVD gently separates the trigeminal nerve’s root from a compressing artery, alleviating the pressure that fuels pain.

Patients with classic (Type 1) TN whose MRI reveals arterial compression tend to respond best to MVD. Yet outcomes vary: some enjoy complete, long‑lasting relief, while others experience only temporary respite, sometimes necessitating repeat surgeries.

Potential complications—such as anesthesia dolorosa, a paradoxical numbness that can be agonizing—underscore that MVD isn’t a guaranteed cure.

For those with atypical (Type 2) TN or other facial pain syndromes, alternative procedures like rhizotomy, glycerol injections, or balloon compression may be recommended.

So where does this leave us? In a landscape where the disorder remains a formidable adversary. Some therapies work wonderfully for a subset of patients, but durability is uneven. Managing TN requires relentless trial‑and‑error, perseverance, and a partnership between patient and clinician.

Research is relentless. With continued scientific dedication, a definitive cure—or at least a consistently reliable long‑term treatment—may soon be within reach.

5 Triple Whammy

Trigeminal neuralgia rarely travels alone. It often brings along a trio of unwelcome companions, turning an already excruciating experience into a full‑blown health crisis.

The most documented partner is multiple sclerosis (MS). Researchers remain uncertain whether MS triggers TN or vice‑versa, but data reveal that 1–2 % of MS patients present with TN as their inaugural symptom.

Among women with TN, a startling 18 % also carry an MS diagnosis, while 2 % of all MS sufferers develop TN. Moreover, a rare subset—about 5 % of TN‑MS patients—endure bilateral facial pain, a condition typically confined to one side.

Migraines and cluster headaches also frequently co‑occur with TN. Though one does not directly cause the other, their proximity to the trigeminal nerve suggests a tangled web of shared pathways that amplify overall discomfort.

Ironically, many anticonvulsant medications prescribed for TN can themselves provoke headaches, creating a paradox where treatment for one pain source ignites another.

The psychological toll is equally severe. Chronic, unpredictable pain often fuels depression, eroding quality of life and mental well‑being. Patients report heightened anxiety, social withdrawal, and a pervasive sense of hopelessness.

These multifaceted challenges reshape every facet of a sufferer’s existence: from the terror of diagnosis to the ongoing battle to maintain cherished activities, and the relentless erosion of optimism.

Fortunately, support networks—both online forums and in‑person groups—offer a lifeline, fostering community, shared strategies, and emotional sustenance for those navigating this complex landscape.

4 Differential Diagnosis

Pinpointing trigeminal neuralgia early can dramatically improve outcomes. Experts outline a clear roadmap to sidestep the endless maze of misdiagnoses.

First, if you’re battling tooth pain, schedule a dental visit—but make sure the dentist knows about TN. Encourage them to entertain a differential diagnosis before extracting any teeth. If they’re unfamiliar, it may be time to seek a second opinion.

Second, secure an appointment with a neurologist promptly. Neurologists specialize in nerve‑related disorders and can chart a tailored treatment plan. While waiting for a specialist, collaborate with your primary‑care physician to manage symptoms.

Third, should a pain episode force you into the emergency room, brace yourself for skeptical questions. Emergency physicians aren’t always versed in TN, so bring written notes summarizing your condition. Having a concise handout can be a lifesaver when you’re in severe agony.

Ask the ER staff whether a neurological consultant is available. Remember, standard painkillers and opioids offer only modest relief for nerve pain. The first line of emergency pharmacology often involves an IV dose of fosphenytoin (Dilantin). Knowing this ahead of time empowers you to advocate for appropriate care.

After a thorough neurological work‑up, request a written emergency care plan from your doctor. Carry it with you to any urgent‑care visit to avoid confusion and ensure swift, targeted treatment.

Finally, a self‑assessment tool created by a leading international TN researcher can guide you through a reasonably accurate self‑diagnosis. The tool is publicly available and can help you arrive at a provisional diagnosis before stepping into a clinic.

Armed with a tentative diagnosis, you can approach each medical appointment with confidence, increasing the odds of a swift, accurate identification of the condition.

3 Famous Faces

Though rare, trigeminal neuralgia has left its mark on several well‑known personalities, both past and present.

Social activist and writer Gloria Steinem has openly discussed her struggle with TN, describing attacks that leave her speechless and immobilized.

HR, the charismatic vocalist of the legendary reggae‑punk outfit Bad Brains, underwent a “bad brain” surgery to tame his TN. A GoFundMe campaign raised $16,000 for the procedure, and post‑op updates indicate a positive recovery.

Bollywood megastar Salman Khan disclosed his diagnosis in 2011, traveling to the United States for treatment. He used his platform to raise awareness, famously quipping, “If there was a choice to give this pain to my worst enemy, I would not give it. They wouldn’t be able to take it.”

In 2015, UK Member of Parliament Andrea Jenkyns faced public criticism after a speech faltered. She clarified that a bout of trigeminal neuralgia was the culprit, labeling the experience “excruciating” and “sporadic.”

2 Gaining Recognition

Advocacy groups for facial pain and TN have fought tirelessly to secure research funding and public awareness. Their efforts bore fruit on October 5, 2017, when the U.S. House of Representatives passed House Resolution 558, officially designating October 7 as National Trigeminal Neuralgia Awareness Day.

The facial‑pain community is also lobbying the World Health Organization to recognize October 7 as International Trigeminal Neuralgia Awareness Day, a proposal submitted on July 1, 2017.

Media coverage of TN is gradually expanding, appearing in news stories, television programs, and short films. As visibility rises, patients discover they’re not alone, researchers gain motivation to seek cures, and clinicians become more adept at recognizing and treating the disorder, reducing future misdiagnoses.

1 The Good (Forget The Bad And The Ugly)

After wading through all the unsettling facts, there’s a silver lining: resources and strategies exist to make life with TN more manageable and hopeful.

If you or a loved one grapples with this condition, consider tapping into the following best‑practice guidelines and support networks.

Connection: Join groups such as the Facial Pain Association, TNnME, and active social‑media communities. Sharing experiences can alleviate isolation.

Self‑Care: Become your own champion. Identify personal triggers, devise a family‑wide response plan for flare‑ups, and incorporate relaxation techniques into daily routines.

Pain Management: Seek out a pain‑management specialist. These clinicians often employ innovative, multimodal approaches that complement standard treatments.

Be Your Own Advocate: Keep meticulous records of diagnoses, test results, medications, ER visits, and physician contacts. Carry this file to every appointment to ensure continuity and assertiveness.

Sometimes, Michael likes to write.