Migraines can induce a wide range of symptoms, including nausea, dizziness, light sensitivity, and intense headache pain. They are frequently preceded by a visual or sensory disturbance known as an aura. Dehydration and low blood sugar are two more diseases linked to headaches and nausea. These problems can also occur independently of each other as side effects of certain medications or environmental factors. Headaches are common complaints that many people struggle with to one degree or another. Although they can be caused by a variety of factors, most headaches are due to irritation of the brain cells (neurons). This can be caused by factors such as stress, illness, or certain substances found in some foods. A nerve called the trigeminal nerve is responsible for sending messages from the face and head up into the brain. If this nerve is irritated, it can cause headaches. Other nerves in the head may be irritated too, which would also lead to headaches. Headaches can be classified according to what part of the head they originate from. Also, headaches can be divided into two broad categories: chronic and acute. Chronic headaches last for three months or longer and affect 1 in 5 people at some point in their lives. Acute headaches occur suddenly and reach maximum severity within 30 minutes. They are also referred to as recurrent headaches because you will experience one or more attacks per day.