Chemical activity in your brain, the nerves or blood vessels surrounding your skull, or the muscles of your head and neck can play a role in primary headaches. Some people may also carry genes that make them more likely to develop such headaches.
Chemical activity in your brain, the nerves or blood vessels surrounding your skull, or the muscles of your head and neck (or some combination of these factors) can play a role in primary headaches. Some people may also carry genes that make them more likely to develop such headaches.
