A migraine is not just a bad headache. It’s a complex neurological event that unfolds in distinct phases, produces symptoms far beyond head pain, and involves different biological mechanisms than a typical tension headache. The core distinction: a tension headache causes steady pressure across your head, while a migraine produces moderate to severe throbbing pain, often on one side, accompanied by nausea, light sensitivity, or both. Understanding where your symptoms fall can help you get the right treatment faster.
What a Tension Headache Feels Like
The most common type of headache is the tension headache, and most people have experienced one. It feels like steady pressure or tightness wrapping around your head, sometimes described as a vice squeezing from both sides. The pain is usually mild to moderate, and while it’s uncomfortable and distracting, it rarely stops you from going about your day. Walking, climbing stairs, or other routine physical activity doesn’t make it worse. You generally won’t feel nauseous, and light and sound don’t become unbearable.
Tension headaches can last anywhere from 30 minutes to several hours. They’re often triggered by stress, poor posture, dehydration, or lack of sleep, and they typically respond well to over-the-counter pain relievers like ibuprofen or acetaminophen.
What Makes a Migraine Different
A migraine is a neurological disorder, not simply a more intense version of a headache. Formally, a migraine attack lasts 4 to 72 hours and has at least two of these pain characteristics: it’s on one side of your head, it throbs or pulses, the intensity is moderate to severe, and routine physical activity like walking or climbing stairs makes it noticeably worse. On top of the pain, you’ll experience nausea, vomiting, or a pronounced sensitivity to light and sound.
That combination is the key dividing line. A tension headache is pressure without those extra neurological symptoms. A migraine pulls your whole nervous system into the event. About 69% of people with migraine report significant light sensitivity, and many also become sensitive to sound, smell, and even touch on their skin. The pain is disabling in a way that a tension headache rarely is. Globally, migraine is ranked among the top causes of years lived with disability.
Migraine Has Four Phases
One of the most surprising things about migraine is that the headache itself is only one part of a larger process that can stretch over days. A full migraine attack can move through four distinct phases, though not everyone experiences all of them.
Prodrome
Hours or even days before the pain starts, your body may send warning signals. The most common are fatigue (occurring in about 73% of attacks), difficulty concentrating (51%), and a stiff neck (50%). Other prodrome symptoms include irritability, yawning, food cravings, frequent urination, light sensitivity, and mood changes. Many people learn to recognize these signals as a reliable preview that a migraine is coming, which can be useful for early treatment.
Aura
About one in four people with migraine experience aura, a short-lived set of neurological symptoms that typically build over 5 minutes and last up to an hour. The most common form is visual: you might see geometric patterns, shimmering lights, zigzag lines, or blind spots in both eyes. Some people experience tingling in their face or hands, or have difficulty finding words. Aura is caused by a slow wave of electrical activity that sweeps across the brain’s surface, briefly exciting and then suppressing normal nerve function as it goes. This wave moves at roughly 3 to 5 millimeters per minute, which is why aura symptoms tend to evolve gradually rather than appearing all at once.
Headache
The pain phase typically lasts several hours to three days. Beyond the throbbing head pain, this phase often brings nausea, anxiety, difficulty sleeping, and heightened sensitivity to sound, light, and smell. Many people need to retreat to a dark, quiet room and are unable to work or carry on with daily activities.
Postdrome
After the pain fades, a “migraine hangover” can linger. Symptoms include fatigue, body aches, dizziness, trouble concentrating, and continued light sensitivity. The length varies, but many people feel washed out for a day or more before fully recovering.
Why Migraines Happen in the Brain
Tension headaches are largely driven by muscle tension and pain signaling in the head and neck. Migraines involve a fundamentally different process. The leading explanation centers on a network of nerves called the trigeminovascular system, which connects the brain’s pain-sensing nerve (the trigeminal nerve) to the blood vessels surrounding the brain.
During a migraine, the trigeminal nerve becomes activated and releases a powerful signaling molecule called CGRP. This molecule triggers inflammation around the brain’s blood vessels and amplifies pain signals. CGRP is now a proven therapeutic target, and several newer migraine treatments work by blocking it directly. The trigeminovascular system is widely accepted as a fundamental pathway in migraine and has become the road map for developing new therapies.
This underlying biology explains why migraines behave so differently from regular headaches. The process involves widespread changes in brain activity, nerve signaling, and inflammation that a simple tension headache does not produce.
Treatment Is Not the Same
Because the underlying biology is different, treatment strategies diverge significantly. A tension headache usually responds to standard over-the-counter pain relievers. Migraines can sometimes be helped by OTC options (a combination of aspirin, acetaminophen, and caffeine is one common approach), but many people need migraine-specific medications.
Triptans are the current gold standard for stopping a migraine once it starts. They work by calming the overactive trigeminal nerve signaling and narrowing dilated blood vessels. They’re effective for many people, though they aren’t suitable for those with certain cardiovascular conditions. Using triptans more than 9 times per month can actually lead to a rebound pattern called medication adaptation headache, where the treatment itself starts causing more headaches.
A newer class of medications called gepants works by blocking CGRP, the inflammatory molecule at the heart of migraine biology. They don’t constrict blood vessels the way triptans do, making them an option for people with heart disease or high blood pressure. They also help some patients who didn’t get relief from triptans. Another newer option, called a ditan, targets serotonin receptors on the nerve itself rather than in blood vessels, offering yet another route for people who can’t safely use triptans.
The same caution about overuse applies to OTC pain relievers as well. Taking them 15 or more days per month can trigger medication adaptation headache, creating a frustrating cycle of daily or near-daily head pain.
How to Tell Which One You Have
The simplest way to distinguish the two is to ask yourself a few questions about your last episode. Was the pain throbbing or pulsing, or was it a steady squeeze? Was it mostly on one side, or did it wrap around both sides? Did moving around make it worse? Did you feel nauseous, or did light and noise become hard to tolerate? If you answered yes to several of those, you’re likely dealing with migraine rather than a tension headache.
Keeping a headache diary for a few weeks can make the pattern clearer. Track when the pain starts, what it feels like, how long it lasts, and what other symptoms come with it. Pay attention to early warning signs like unusual fatigue, neck stiffness, or difficulty concentrating, since recognizing prodrome symptoms can help you treat a migraine earlier in its course, when intervention tends to be most effective.