Our expert says:
A migraine is caused by abnormal brain activity, which is triggered by stress, certain foods, environmental factors, or something else. However, the exact chain of events remains unclear. Today, most medical experts believe the attack begins in the brain, and involves various nerve pathways and chemicals. The changes affect blood flow in the brain and surrounding tissues. For more info have a look at http://1.usa.gov/hfoj1E
If you suffer from regular migraines, the best option would have to ask your doctor to work out a treatment regime. This may include spesialised migraine medicines (i.e. Maxalt, etc), analgesics or even certain types of antidepressants.
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