The 3 most common causes and triggers of headaches

Headaches are among the most relatable of human complaints – and one of the most disruptive. Whether it’s a dull, lingering discomfort or a sudden, throbbing pain, a hurting head can derail a workday, sap your energy for relationships or family time and make even simple conversations feel overwhelming.

Head pain is also incredibly prevalent. “Nearly everyone has a headache occasionally,” notes the World Health Organization. And while some headaches fade quickly with rest or a couple of over-the-counter pain pills, others can last for hours or even days and become downright debilitating.

Understanding why your head hurts is the first step toward finding relief and knowing when it’s time to see a doctor.

Why does my head hurt?

There’s no single reason for head pain, which is why headaches are generally divided into several types, says Dr. Robert Cowan, a neurologist with board certification in neurology, pain medicine and headache medicine at Stanford Health Care.

The main categories are primary headaches – such as migraine, tension-type and cluster headaches – and secondary headaches, which are caused by another condition, such as trauma, infection, tumors or side effects from medication.

Tension-type headaches are the most common primary headaches overall and are often linked to muscle tightness from stress, posture or long hours at a computer. Migraine headaches, though less common in the general population, are the type most frequently treated by doctors and can be especially debilitating – causing nausea, extreme sensory sensitivity and visual changes.

Not all primary headaches have obvious explanations. “Headaches, in a nutshell, are conditions of neuro-inflammation, and almost anything can cause inflammation,” says Dr. Fred Cohen, a neurologist and medical director of Headache Intervention at the Icahn School of Medicine at Mount Sinai.

Complicating matters further, head pain can sometimes be a warning sign of something more serious, such as an infection or vascular problem.

What causes headaches?

For primary headaches, there’s often no single root cause, just processes in the brain and surrounding tissues that become overactive. “A migraine is a neurological condition that many people are born with,” Cohen says.

Tension-type headaches are often associated with stress, poor nutrition, dehydration, lack of sleep, head trauma or muscle strain. Cluster headaches are rarer but more severe and are linked to changes in a brain structure called the hypothalamus and tend to occur in predictable patterns.

Environmental factors can also play a role. Bright lights, loud noises, strong odors, hormonal changes, certain foods and even shifting weather patterns have all been shown to trigger headaches, especially in those prone to migraine attacks. But triggers vary widely. “Two people with the same diagnosis may have entirely different sets of triggers,” says Cowan.

Secondary headaches can stem from sinus infections, concussions, dental problems or serious conditions or issues like meningitis or brain bleeding.

How to stop my head from hurting

Finding relief starts with identifying the cause of a headache, especially when they occur frequently or are especially painful. “The first questions we always ask are: What kind of headache is it and what caused it?” says Cohen.

Tension headaches often improve with rest, hydration, gentle stretching or over-the-counter pain killers. Warm compresses can also ease neck tension, while cold packs may help with forehead pain. Migraine relief may require prescription medication, plus preventive steps such as maintaining regular sleep, consistent meals, stress management routines and avoiding known triggers.

“If the headache is secondary and due to an underlying cause, then the causative condition needs to be addressed,” says Cowan.

It’s important to seek medical attention if headaches are frequent, severe, sudden or accompanied by vision changes, weakness, numbness, confusion, fever, weight loss or worsen with exertion. Cohen adds that headaches that change with bodily position, occur during pregnancy, or develop after age 50 also warrant evaluation.

“Any time you have pain, your brain is telling you something is wrong,” explains Cowan. Sometimes, the message is obvious, like not hitting your thumb again with a hammer. “But sometimes the pain is telling you there’s something in your body or your environment that’s threatening; and you need to pay attention, figure it out and do something about it.”