Headaches:

Headaches are a common symptom that may have many causes and varying degrees of severity. If headaches persist for more than a couple of days or if they are incredibly painful, then it is important to see a physician immediately. Otherwise, common headaches may have a number of causes: stress, fatigue, alcohol, toxic substances, food allergies, infections, head or back injuries, high blood pressure, low oxygen to the brain, and any problems or infections of the eyes, ears, nose or teeth.

Mild to severe pain
Localized to one spot or generalized to an area
Stabbing, pounding, throbbing pain

Treatment:

Lifestyle Changes:

Decrease stress
Get 8 hours of sleep at night
Avoid alcohol
Avoid exposure to chemicals which may trigger headaches
Get a dental check-up
Exercise to get more oxygen to your brain
Relaxation exercises
If congested, consider an air filter in your bedroom and eliminate dust and dust mites by cleaning thoroughly.

Dietary Changes:

Eat small meals every three hours. Low blood sugar may increase the occurrence of headaches.
Rule out food allergies by doing an elimination diet of suspected foods.
Green tea contains some caffeine, which aids in blood flow to the brain. Its antioxidant properties are also anti-inflammatory in its action.