If you’ve ever stubbed your toe, pulled a muscle, or suffered a migraine, you’ve experienced pain. But what is pain, exactly?

Is it just a signal from the body that something’s wrong? Is it all in the brain? Can it be measured? And why do two people with the same injury report completely different levels of pain?

According to Jordan Sudberg, a leading pain management specialist, these are not just philosophical questions—they’re at the core of how we treat, understand, and ultimately relieve human suffering.

“Pain isn’t just a physical sensation,” says Dr. Sudberg. “It’s an emotional, neurological, and subjective experience. To treat pain effectively, we need to define it clearly, understand its dimensions, and respect its complexity.”

In this article, Dr. Sudberg helps clarify what pain really is—and what it’s not—by breaking down its definitions, types, and implications for modern medicine.

The Official Definition of Pain—And Why It’s Not Enough

The International Association for the Study of Pain (IASP) defines pain as:

“An unpleasant sensory and emotional experience associated with, or resembling that associated with, actual or potential tissue damage.”

At first glance, this seems straightforward. But Dr. Sudberg argues it only scratches the surface.

“What makes pain so hard to define,” he explains, “is that it’s both a biological signal and a personal experience. Two patients with identical injuries might describe their pain in completely different ways. One may be incapacitated, the other mildly annoyed. That doesn’t mean one is lying—it means pain is subjective.”

Pain Is a Warning System—But It’s Not Always Accurate

Pain has an evolutionary purpose: it’s your body’s way of saying, “Stop, something’s wrong.” It alerts you to injury, infection, or disease. But that doesn’t mean pain always reflects physical damage.

Dr. Sudberg often treats patients who experience intense pain even after the original injury has healed.

“Pain can persist long after the tissue has recovered,” he says. “In those cases, the nervous system essentially gets stuck in ‘alarm mode.’ That’s where chronic pain begins—and where defining pain becomes really critical to treatment.”

This helps explain conditions like fibromyalgia, neuropathic pain, or phantom limb pain, where pain exists without visible injury. These are not imaginary; they are real, neurobiological experiences that require specialized care.

Acute Pain vs. Chronic Pain: Two Different Beasts

Dr. Sudberg emphasizes the importance of distinguishing between acute and chronic pain:

• Acute Pain: Typically results from a specific injury or illness. It has a clear cause and usually resolves as the body heals (e.g., broken bone, surgery recovery).
• Chronic Pain: Lasts longer than 3–6 months, often with no clear injury or ongoing cause. It may become a condition in itself.

“Chronic pain is not just ‘pain that lasts a long time,’” says Sudberg. “It rewires the nervous system and can fundamentally change how the brain processes sensations.”

Understanding this difference helps clarify why pain management isn’t just about medication—it’s about rewiring the system, retraining the brain, and addressing both the physical and emotional dimensions of suffering.

The Brain’s Role in Pain: It’s More Than Just Nerves

One of the most misunderstood aspects of pain is the role of the brain. While pain is often triggered by nerve signals traveling from an injury site, it’s the brain that ultimately decides what hurts.

“Pain is not produced at the site of the injury,” Dr. Sudberg explains. “It’s constructed by the brain based on input from nerves, memories, emotions, and expectations.”

This explains why:

• Emotional stress can intensify pain
• Distraction can reduce pain
• Placebos can sometimes ease pain
• Depression and anxiety are closely linked to pain disorders

The mind-body connection is not philosophical fluff—it’s a scientific fact. And understanding this connection is essential to any modern pain management strategy.

Pain Without Injury, and Injury Without Pain

There are fascinating (and sometimes dangerous) cases where people experience pain without an injury—or injuries without pain.

For example:

• A soldier wounded in battle might feel no pain until the fight ends.
• A construction worker may impale his foot with a nail but feel no pain until he sees it.
• A patient with neuropathy may experience searing pain in a limb that appears completely normal.

These cases support the view that pain is not a direct measurement of tissue damage, but rather a complex protective output of the brain. And that makes defining pain even more nuanced.

Why a Clear Definition Matters—Clinically and Ethically

Misunderstanding pain leads to misdiagnosis, mistreatment, and—too often—dismissal of suffering.

“We’ve made mistakes in the past,” Dr. Sudberg admits. “Over-prescribing opioids, underestimating the psychological component, or labeling patients as ‘drug-seeking’ when they were simply desperate. A clearer definition of pain helps prevent those errors.”

In clinical practice, defining pain correctly ensures:

• Patients are believed and heard
• Treatment plans address the root cause
• Medication is used appropriately
• Psychological and physical therapies are integrated

A clear definition also empowers patients. When people understand that pain is real, complex, and treatable, they are more likely to engage with treatment and less likely to feel hopeless.

Jordan Sudberg’s Holistic View of Pain

For Dr. Sudberg, defining pain is not about fitting it into a neat box. It’s about expanding our understanding so we can treat it effectively.

His approach includes:

• Physical therapy and rehabilitation to restore function
• Medication only when necessary and appropriate
• Cognitive-behavioral therapy to reframe pain perception
• Neuromodulation and advanced technologies for chronic cases
• Patient education as a critical part of healing

“Pain is not weakness. It’s not imaginary. And it’s not your identity,” Sudberg says. “It’s a signal. When we define it clearly, we can respond clearly—and that’s when true healing begins.”

Final Thoughts

Pain might be universal, but it is never one-size-fits-all. As Jordan Sudberg reminds us, defining pain is both a medical necessity and a moral responsibility. When we get the definition right, everything else—from treatment to compassion—falls into place.

So the next time someone says, “It’s just pain,” remember: there’s no such thing. Pain is complex. Pain is personal. And above all, pain is real.