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.

Many headache experts believe that MSG is one of the biggest triggers while others look to newer research, which suggests that this specific type of additive is not a typical trigger at all.