Headache

Headache is a broad term used for pain or discomfort felt in the head, scalp, face, or neck. It is a very common symptom; most of the time it is not due to a serious cause, but features such as how the pain starts, how long it lasts, associated neurologic symptoms, and the patient's age are highly important in evaluation. ^[1][2]

How are headaches classified?

Headaches are broadly considered primary or secondary. In primary headaches, the pain itself is the main problem; tension-type headache, migraine, and cluster headache fall into this group. In secondary headaches, the pain appears as a symptom of another health condition. MedlinePlus emphasizes that tension-type headache is the most common type and that most people experience headache at some point in life. This is an important distinction: the fact that headache is common does not mean it is always trivial, but it does show that most headaches do not indicate a serious brain disorder. ^[1][3]

The character of the pain offers guidance in differential diagnosis. Tight, pressing, band-like pain associated with neck and shoulder muscle tension fits better with a tension-type pattern. Throbbing attacks accompanied by nausea or sensitivity to light and sound suggest migraine. Very severe pain around the eye that comes in short but clustered attacks may indicate a different headache type. Even so, classifying a headache based only on whether it "throbs" or "presses" is not enough; frequency, duration, and associated symptoms must also be considered together. ^[1][2]

What causes headache?

A substantial proportion of everyday headaches may be related to stress, sleep disturbance, skipped meals, muscle tension, certain triggers, or infections. Mild to moderate headache is common during colds and other viral illnesses. In some individuals, prolonged screen use, heavy cognitive workload, teeth clenching, or tension in the neck muscles may also contribute. These causes do not trivialize headache, but when the relation between pain and daily habits is explored, the clinical picture often becomes easier to understand. ^[1][3]

Headache may also sometimes be associated with spikes in blood pressure, sinusitis, dehydration, certain medications, changes in caffeine intake, or hormonal fluctuations. More serious causes of secondary headache include meningitis, brain hemorrhage, vascular occlusion, temporal arteritis, or head trauma. For that reason, the statement that "headache is very common" should not be automatically reassuring. Headaches with new features, attacks that are clearly different from the person's usual pattern, or headaches accompanied by neurologic symptoms require a more careful approach. ^[2][4]

Which headache features are considered more important?

A thunderclap headache that begins suddenly and reaches maximum intensity within minutes is one of the most important warning signs. Similarly, headache accompanied by fever and neck stiffness may suggest infection, while headache accompanied by weakness, numbness, speech difficulty, altered consciousness, or new vision loss raises concern for neurologic causes. NHS guidance and neurology headache pathways emphasize the need for more urgent evaluation, especially when there is a new neurologic deficit, sudden onset, or systemic symptoms. ^[2][4][5]

A new headache beginning after age 50, headache that becomes progressively more frequent or severe, headache developing after trauma, or headache occurring in someone with a history of cancer or immunosuppression is also more concerning. In children, unusually severe pain for age, morning vomiting, behavioral change, or seizures alter the approach. What matters is not only the headache itself, but also the distribution of associated symptoms, how long the pain has been present, and whether it deviates from the person's usual headache pattern. Even in someone who says, "my headaches are always like this," a new difference should be taken seriously. ^[2][4][5]

How is headache evaluated?

Evaluation begins with questions about when the pain started, how long it lasts, where in the head it is located, and whether similar attacks have occurred before. The clinician asks whether the pain is one-sided or bilateral, whether it throbs, and whether it is accompanied by light or sound sensitivity, nausea, visual symptoms, neck stiffness, or fever. Regular medications, caffeine intake, sleep pattern, and recent infections also help clarify the picture. These details are used to decide whether the headache resembles a primary pattern or a secondary condition that requires further investigation. ^[1][2]

Why does a change in pattern matter in headache?

Even in a person with known migraine or tension-type headache, a change in the character of the pain may be a separate warning sign. For example, attacks that followed a stable pattern for months but then begin waking the person from sleep, become continuous, or are joined by new neurologic symptoms suggest different possibilities. For that reason, it is critical to ask not only "do I have a headache?" but whether this is a new headache or an old headache that has changed its behavior. Clinically, that distinction often begins with the history itself. ^[2][4][5]

During examination, neurologic assessment, blood pressure measurement, and when necessary evaluation for papilledema or neck stiffness may become important. Imaging is not required in every headache; however, clinical priority changes when red flags are present. In headache, the main aim is not merely to label the pain, but to exclude serious causes and correctly understand the pattern. Particularly in newly developed, severe, unusual headaches or headaches accompanied by neurologic findings, individualized medical assessment is important. ^[2][4][5]

Headache is a common symptom; however, if there is sudden onset, a neurologic finding, fever, or a change from the usual pattern, individualized evaluation should not be delayed. ^[1][2]