Many people use the terms “headache” and “migraine” interchangeably, but they are not the same. While headaches are common and generally mild, migraines involve intense neurological symptoms that can disrupt daily life. Understanding the difference between the two can help you seek the right treatment and prevent long-term complications. What Is a Headache? A headache is pain or discomfort in the head, scalp, or neck. It is usually caused by tension, dehydration, stress, sinus issues, or fatigue.