The most common cause of occasional headaches is tension in the muscles of the head, shoulders and neck. The tension can occur from poor posture, prolonged driving or sitting and even from straining of the eyes. Stress and anxiety are a very common cause of tension headaches, because the stress causes constriction of the muscles in the neck and head. Herbs help by relaxing tense muscles, increasing circulation to the brain and reducing stress and anxiety.
Migraines are a specific type of headache that can be extremely painful and are often accompanied by vision disturbances, heightened sensory perception, dizziness, nausea and even vomiting. Migraines usually begin on one side of the head and can last anywhere from a couple hours to a couple days. Migraines are caused by disturbances of blood flow to the head, a combination of excessive constriction or expansion of the brain's blood vessels that leads to severe pain.