Some headaches occur from eating foods that contain certain additives and preservatives, such as those found in processed foods. Symptoms can begin within 20 to 25 minutes after eating products that contain additives. Some reports state that headaches brought on by foods containing MSG such as potato chips and other snacks can occur within an hour of eating.

Below are seven symptoms to look for:

1. Chest pressure.
2. Tightening and pressure in the face.
3. Burning sensation in the chest, neck, or shoulders.
4. Facial flushing.
5. Dizziness.
6.Headache pain across the front or sides of the head. (Unlike more classic migraines, headaches brought on by additives are usually sensed on both sides of the head.)
7. Abdominal discomfort.

Studies have shown that regular practice of relaxation and biofeedback techniques results in a 45 to 80% reduction or elimination in both migraine headache severity and frequency.

The essence of biofeedback is to learn how to encounter stress without muscle tension, rapid heart rate and respiration, perspiration, or lowered body temperature. A typical course of biofeedback consists of eight to ten weekly 30 to 45-minute sessions. Learning to control body functions such as temperature occurs through muscle relaxation, which is achieved through relaxation, visualization, and breathing techniques.

A conscious effort is required in the first few weeks of training, but gradually these very brief relaxation techniques can become a subconscious habit. It can be quite helpful in relieving tension throughout the day, which in turn will reduce the frequency of headaches.