MARK CLARKE / SCIENCE PHOTO LIBRARY MARK CLARKE / SCIENCE PHOTO LIBRARY
Headache. Young boy, three years old suffering from headache. The child is lying in bed with his toy teddy bear and holding his hand to his forehead. Headaches are one of the most common types of pain. Usually, headaches are caused by irregular meals, excitement or excessive noise. Occasionally, they may be the symptom of a more serious underlying disorder.
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