This is when you should worry about headaches
Neurologist Fayyaz Ahmed, author of the 2012 study published in the British Journal of Pain, explains that secondary headaches encompass a group of head disorders that are rare, but very dangerous if left untreated. Secondary headaches are caused by other medical problems and can indicate serious, undiagnosed medical conditions. Conditions can include bleeding in the brain, brain tumors, blood clots in the brain, meningitis, or inflammation of the arteries in the head (giant cell arteritis).
Cedars-Sinai warns that young women are especially susceptible to blood clots, especially if they smoke or take birth control, as well as after giving birth. Recurring early morning headaches, nausea, and vision changes could signal a blood clot in the brain. People over the age of 50 who have sweating, fever, blurred vision, neck or shoulder pain, and scalp tenderness with headache should get checked for arteritis at giant cells, says the Best Practice Advocacy Center New Zealand. The National Headache Foundation says headaches accompanied by fever, stiff neck, drowsiness, and confusion may indicate meningitis or encephalitis. Both are central nervous system disorders and can often be treated with antibiotics if seen immediately.
If you or someone in your household experiences a new headache with any of these symptoms, you should tell your healthcare provider immediately.