What causes chronic headaches? i've had a negative brain mri.

Many causes: Headaches can be due to many causes primary headaches 1migraine 2tension headache 3cluster headaches secondary headaches 1excessive use of analgesics 2post head injury(concussion) 3cranial neuralgias due to inflammation of 12 nerves which supply motor;sensation to head;neck 4brai tumors 5high blood pressure 6sinus problems 7pseudotumor cerebri 8 other rare conditions see doctor to find out

Increased blood flow: Ironically, increased blood flow to certain parts of the brain causes migraines, which is 1 type of chronic headache. Although nothing is "proven", the association b/w sinus conditions (sinusitis) & the development of chronic headaches is strong. There r many other potential causes. Brain MRI, while useful in excluding a tumor, rarely shows any cause for chronic headaches.Talk to a neurologist.

Everything: The causes of headaches would fill up many books. Almost everything can cause headaches. The most common MRI finding in a brain study for headache is "negative". But that does NOT mean there is nothing wrong with you. If you have severe or recurrent headaches, you may have to visit a Doctor who specializes in headaches to get a complete evaluation.