What should you know about constant headache for days?

A continuing headache may relate to tension, migraine, disrupted sleep, dehydration, an infection, sinus inflammation, eye strain, or frequent use of pain medicine. [Common Cold](/conditions/common-cold/) and [Chronic Sinusitis](/conditions/chronic-sinusitis/) can cause congestion or facial pressure, but a headache lasting days still needs context. The location, quality, associated symptoms, and change from your usual pattern matter more than duration alone. A symptom description cannot confirm the cause.

Arrange a medical review and bring a list of medicines, including doses and how often you use them. Until reviewed, rest, drink normally, eat if able, limit screen glare, and avoid alcohol. Do not keep escalating pain medicine beyond its label or a clinician’s instructions. Note onset, severity, triggers, sleep, fever, congestion, nausea, and any visual or neurological changes.

Use emergency services for a thunderclap headache, new weakness or numbness, difficulty speaking, fainting, seizure, confusion, vision loss, repeated vomiting, fever with a stiff neck, or a headache after head injury. Seek prompt care if the pain is steadily worsening, wakes you repeatedly, occurs with a new rash, or is unlike your usual headaches. Do not drive if symptoms impair alertness or vision.

Ask what headache pattern your symptoms resemble, whether your medicines could be contributing, and whether an examination or further tests are appropriate. Explain whether you have nasal symptoms, fever, thirst, neck stiffness, pregnancy, or recent travel. [COVID-19](/conditions/covid-19/) and [Dehydration](/conditions/dehydration/) are examples of wider contexts that may change the assessment.