Most headaches fall into one of a few common categories, and the location, timing, and quality of your pain can tell you a lot about which one you’re dealing with. Tension-type headaches affect roughly 25% of the global population, and migraines affect about 14%. Together, these two types account for the vast majority of headaches people experience. Understanding what yours feels like, where it hits, and what else is going on in your life can help you narrow down the cause.
Tension-Type Headaches
If your headache feels like a dull, steady pressure across your forehead or wrapping around the sides and back of your head, you’re likely experiencing a tension-type headache. These are the most common headaches, and they tend to feel like a tight band squeezing your skull rather than a sharp or throbbing pain. Episodes can last anywhere from 30 minutes to a full week.
Common triggers include stress, poor sleep, long hours at a screen, skipped meals, and neck or shoulder tension from bad posture. For most people, occasional tension headaches respond well to rest, hydration, and over-the-counter pain relievers. When they become chronic, meaning they occur most days and last for hours at a time or feel nearly constant, they may need a different management approach.
Migraines
Migraines are a distinct neurological event, not just a bad headache. The pain is typically throbbing, often on one side of the head, and tends to worsen with physical activity, light, or sound. A migraine attack actually unfolds in stages. Hours before the pain starts, you might notice fatigue, food cravings, mood changes, or neck stiffness. About a quarter of people with migraines also experience an aura phase: visual disturbances like zigzag lines or blind spots, or tingling in the face or hands.
During the pain phase, nerve pathways that supply pain-sensitive structures inside the skull, including the lining of the brain and the large blood vessels around it, become activated. A signaling molecule called CGRP plays a central role, which is why newer migraine treatments specifically target it. After the headache fades, many people feel drained, foggy, or off for another day or so. That recovery window is a normal part of the attack.
One important detail: more than 85% of people who believe they have sinus headaches actually have migraines. Migraines frequently cause nasal congestion, facial pressure, and watery eyes, which leads to the confusion. If your “sinus headaches” come with nausea, sensitivity to light, or throbbing pain, migraine is the more likely explanation.
Cluster Headaches
Cluster headaches are less common but unmistakable. The pain is severe, piercing, and almost always centered around or behind one eye. Individual attacks last between 15 minutes and 3 hours and can occur anywhere from once every other day to eight times in a single day. They tend to arrive in clusters lasting weeks or months, then disappear for a stretch before returning.
What sets cluster headaches apart is the set of autonomic symptoms that accompany the pain on the same side: a red or watery eye, a drooping eyelid, a constricted pupil, nasal congestion or a runny nose, and forehead sweating. People in the middle of a cluster attack often feel restless and unable to sit still, which is the opposite of migraine, where most people want to lie down in a dark room.
Dehydration and Skipped Meals
Sometimes the cause is simpler than you’d expect. When you’re dehydrated, your brain and surrounding tissues shrink slightly, pulling away from the skull. That traction on the nerves between your brain and skull is what produces the pain. A dehydration headache typically affects the whole head, gets worse when you bend over or move quickly, and improves steadily as you rehydrate.
Skipped or delayed meals can trigger headaches through a drop in blood sugar, which affects the brain’s fuel supply. If your headache showed up after a long gap between meals or on a day you haven’t been drinking enough water, start there before looking for more complicated explanations.
Hormonal Shifts
Estrogen and progesterone influence pain-signaling chemicals in the brain, and drops in estrogen levels are a well-established headache trigger. Many people with migraines notice that their worst attacks cluster in the two days before a period starts or during the first few days of menstruation, when estrogen falls sharply. Steady estrogen levels tend to improve headaches, which is why some people find their migraines ease during the second and third trimesters of pregnancy, when estrogen is consistently high.
Hormonal contraceptives can help or worsen the pattern depending on the person and the formulation. If your headaches follow a clear monthly rhythm, tracking them alongside your cycle for two to three months can reveal whether hormones are the primary driver.
Medication Overuse Headaches
This is one of the most overlooked causes of frequent headaches, and it creates a frustrating cycle. If you use simple over-the-counter painkillers like ibuprofen or acetaminophen on more than 15 days a month, or triptans, combination painkillers, or opioids on more than 10 days a month, the medication itself can start generating headaches. The pain often shows up in the morning, improves briefly after taking a dose, then returns as the medication wears off.
The only effective treatment is to reduce or stop the overused medication, which typically makes headaches worse for a week or two before they improve. If you find yourself reaching for pain relievers most days of the week, the medication may be part of the problem rather than the solution.
Other Common Triggers
Several everyday factors can cause or worsen headaches. Poor sleep is one of the strongest, whether that means too little sleep, inconsistent sleep schedules, or undiagnosed sleep apnea. Caffeine plays a dual role: regular intake causes your body to adapt, and missing your usual dose can trigger a withdrawal headache within 12 to 24 hours. Alcohol, particularly red wine, is a well-known trigger for many people.
Eye strain from prolonged screen use, uncorrected vision problems, or reading in poor light can produce a dull ache around the forehead and temples. Jaw clenching or teeth grinding, especially overnight, often causes headaches that are worst in the morning and centered around the temples. Environmental factors like strong perfumes, weather changes, bright or flickering lights, and high altitudes round out the list of common culprits.
Warning Signs That Need Immediate Attention
The vast majority of headaches are not dangerous, but a small number signal something serious. You should seek emergency care for a headache that comes on suddenly and reaches maximum intensity within seconds (often described as a thunderclap), because this pattern can indicate bleeding around the brain. Other warning signs include a headache with fever and stiff neck, confusion or changes in consciousness, weakness or numbness on one side of the body, vision changes, or seizures.
A new type of headache starting after age 50 deserves prompt evaluation, as does any headache that follows a head injury, worsens steadily over days to weeks, or changes dramatically when you change position (significantly better or worse when lying down versus standing). Headaches during pregnancy or the weeks after delivery also warrant medical attention, since they can be linked to blood pressure complications or blood clots. None of these scenarios are common, but recognizing them matters because early treatment changes outcomes.