Likely cause
A headache lasting for one week can have many causes. Common reasons include tension-type headache (often related to stress, poor posture, lack of sleep, or prolonged screen use), migraine, dehydration, viral infections, sinus congestion, eye strain, or high blood pressure. Based on the information you've shared, it's not possible to identify the exact cause without knowing where the pain is located, whether it is one-sided or both sides, its severity, associated symptoms (such as fever, nausea, vomiting, sensitivity to light or sound, blurred vision), and whether you've had similar headaches before. An evaluation may be needed if it persists.
What to watch for
Monitor whether the headache is getting worse or staying the same. Check if it is associated with fever, vomiting, neck stiffness, blurred or double vision, dizziness, weakness or numbness in an arm or leg, difficulty speaking, confusion, seizures, or loss of consciousness. Also note if the headache wakes you from sleep, becomes worse on coughing or bending forward, follows a head injury, or if your blood pressure is very high. Keeping a record of when the headache occurs, how long it lasts, its intensity, and possible triggers can help your doctor identify the cause.
What you can do
Make sure you're drinking enough water, getting adequate sleep, and eating regular meals. Reduce screen time if possible and take breaks every 20-30 minutes while using a phone or computer. Avoid excessive tea, coffee, alcohol, and smoking. Rest in a quiet, well-lit room if the headache worsens. If you wear glasses, ensure your prescription is up to date. Monitor your blood pressure if you have hypertension or access to a BP machine. Avoid taking painkillers on most days of the week, as frequent use can itself lead to medication-overuse headaches. If symptoms continue, arrange an in-person medical evaluation.
When to see a doctor
Seek urgent medical attention immediately if you develop the "worst headache of your life," sudden severe headache, weakness or numbness, difficulty speaking, confusion, seizures, repeated vomiting, fever with neck stiffness, loss of vision, or headache after a significant head injury. Arrange a doctor's visit within the next day or two if the headache has lasted for a week without improvement, is becoming more frequent or severe, keeps returning, interferes with your daily activities, or is associated with high blood pressure, persistent fever, sinus symptoms, or any concerning neurological symptoms.
This is general information from a verified doctor and is not a diagnosis or a substitute for an in-person consultation. In an emergency, seek immediate medical care.
