Migraine is one of the most common neurological disorders, characterized by recurrent episodes of moderate to severe headache. The pain is often pulsating and typically affects one side of the head. It may be accompanied by nausea, vomiting, and increased sensitivity to light and sound. Migraine is not simply an ordinary headache; rather, it is a complex neurological condition associated with changes in brain activity, communication between nerve cells, and the pathways responsible for transmitting pain signals. Neurological Mechanisms of Migraine Several neurological mechanisms are involved in the development of migraine. Its underlying mechanisms are believed to be associated with altered activity in neural networks responsible for processing and regulating pain. One of the most important mechanisms involves activation of the trigeminal nerve system, which is one of the cranial nerve systems responsible for transmitting sensory information from the face and certain regions of the head. When this system is activated, various neurochemical substances are released, particularly calcitonin gene-related peptide (CGRP). This peptide contributes to pain transmission and affects blood vessels and surrounding nerve tissues, thereby intensifying headache sensations. Another important phenomenon is cortical spreading depression, which plays a significant role in certain migraine attacks, particularly those accompanied by aura. This phenomenon involves a slowly spreading wave of electrical and chemical changes across the cerebral cortex, followed by a period of reduced neuronal activity. It may produce temporary visual or sensory symptoms, such as seeing flashes of light or experiencing tingling and numbness. The Role of Neurotransmitters in Migraine Neurotransmitters play an essential role in regulating pain during migraine attacks. One of the most important is serotonin, which is involved in regulating mood, sleep, and pain perception. Changes in serotonin receptor activity may be associated with migraine attacks, which explains the use of medications targeting these receptors in migraine treatment. Glutamate, an excitatory neurotransmitter, also contributes to regulating the electrical activity of nerve cells. Increased glutamate activity may enhance neuronal excitability and contribute to certain phenomena associated with migraine. Factors That Trigger Migraine Attacks Migraine triggers vary from one individual to another and may include: • Psychological stress and emotional pressure. • Sleep disturbances or irregular sleeping patterns. • Hormonal changes, particularly those associated with the menstrual cycle. • Skipping meals or prolonged fasting. • Dehydration and inadequate water intake. • Exposure to bright lights or loud sounds. • Certain foods and beverages in susceptible individuals. • Changes in weather and atmospheric pressure. It is important to distinguish between triggering factors and the underlying cause of the disorder. These factors may increase the likelihood of an attack in susceptible individuals, but they are not necessarily direct causes of migraine. Symptoms and Clinical Phases of Migraine A migraine attack may consist of four phases, although not all patients experience every phase. 1. Prodrome Phase: This phase may occur hours or days before the headache and can include fatigue, frequent yawning, mood changes, difficulty concentrating, and food cravings. 2. Aura Phase: This phase occurs in some individuals and involves temporary neurological symptoms, such as visual disturbances, tingling, numbness, and speech difficulties. These symptoms usually develop gradually and last between 5 and 60 minutes. 3. Headache Phase: This phase is characterized by pulsating pain that may last between 4 and 72 hours. It may be accompanied by nausea, vomiting, and sensitivity to light and sound. In some patients, physical activity can worsen the pain. 4.Postdrome Phase: Following the attack, patients may experience fatigue, weakness, difficulty concentrating, or mood changes, even after the headache has subsided. Diagnosis of Migraine Migraine diagnosis primarily depends on the patient’s medical history, the description of headache characteristics, attack frequency, and associated symptoms, in addition to clinical and neurological examinations. There is no specific laboratory test that confirms migraine. Brain imaging, such as magnetic resonance imaging (MRI) or computed tomography (CT), is not routinely required in typical cases. However, it may be recommended when unusual symptoms or warning signs are present that require the exclusion of other neurological conditions. Treatment and Prevention Migraine treatment aims to reduce the severity of attacks, decrease their frequency, and improve the patient’s quality of life. Treatment approaches are generally divided into two main categories: Acute Treatment: This approach is used at the onset of an attack and may include nonsteroidal anti-inflammatory drugs (NSAIDs), triptans, or other medications prescribed by a physician according to the patient’s condition and symptom severity. Preventive Treatment: This approach is recommended when attacks occur frequently or significantly interfere with daily activities. It may include certain blood pressure medications, anticonvulsants, some antidepressants, and newer therapies targeting the CGRP pathway. Non-pharmacological measures include maintaining regular sleep schedules, drinking sufficient amounts of water, eating meals regularly, engaging in moderate physical activity, and avoiding known personal triggers. Conclusion Migraine is a complex neurological disorder that extends beyond ordinary headache, involving multiple interactions between nerves, chemical neurotransmitters, and neural networks responsible for pain processing. Understanding these mechanisms has contributed to the development of more targeted treatments, particularly medications that act on calcitonin gene-related peptide (CGRP). Early diagnosis, adherence to an appropriate treatment plan, and identification of triggering factors are essential steps in controlling migraine attacks and improving the quality of life of affected individuals. Al Mustaqbal University The First University in Iraq