When to get it checked properly
Most tension headaches aren't a sign of anything sinister 3. These are the things that should prompt an actual assessment rather than another week of managing it yourself.
Seek urgent medical care for a headache that comes on suddenly and severely; a headache with vomiting, confusion, neck stiffness, fever, a change in vision or a seizure; a headache after a head injury; a headache that's worse when you lie down or cough; one that has been progressively worsening over weeks; a morning headache with persistent nausea; or any new or different headache during pregnancy 1.
Book in with your GP if you have jaw pain when eating, blurred or double vision, a sore scalp, or numbness or weakness in your arms or legs 3, or if your headache is one-sided and throbbing, comes with nausea or light sensitivity, or stops you doing normal things 3.
Come and see us when the headaches are recurring, your neck and shoulders are part of it, you're reaching for pain relief more than two or three times a week 1, or the pattern hasn't shifted despite you doing the sensible things. None of that is an emergency. It's just the point where working it out with someone beats guessing on your own.