Meningeal blood-vessel swelling, which stretches nerves, causes primary headaches {headache}| {primary headache}. Hormones, stress, and little sleep act on brain pain centers to produce serotonin and norepinephrine and cause blood-vessel swelling. Sinus pressure, pinched nerves, or irritation causes secondary headaches.
Biological Sciences>Medicine>Disease>Kinds>Organ>Nerve>Pain>Headache
4-Medicine-Disease-Kinds-Organ-Nerve-Pain-Headache
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Date Modified: 2022.0224