Everyone experiences headaches. From dull throbbing dehydration headaches to incapacitating migraines, a sore head is an extremely common complaint. This is perhaps especially true at the moment. COVID-19 can cause them, as can sitting at desks for too long, and not getting out of the house enough. When headaches strike, many people’s reaction is to reach for a painkiller. And these can do the job. But a better solution is often to probe the reasons behind the pain—especially if you get similar types of headaches a lot. Even though they all entail pain, where the pain is can clue us into what type of headache we are experiencing. Pain in the face and forehead are markers of sinus-related headache while the sensation of a pneumatic drill somewhere in our cranium is often migraine. But ultimately, all headaches are caused by vasodilation in the head—the widening of blood vessels near the brain. This stretches sensory …