Patients with a burst of headache on the left side mainly consider the following causes: 1. To be considered a migraine attack, migraine is the most common type of primary headache in clinical practice. It is a functional pain, and the degree of headache is usually moderate to severe, and will be accompanied by nausea and vomiting in severe cases. It is usually triggered by poor rest, exertion, mental stress, and dietary stimulation. In addition to taking the right pain medication, patients in this category should avoid the factors that trigger headache attacks in their daily life. 2. Patients who have a burst of headache on the left side should consider the headache of neurasthenia nature, which is also very common. 3. Patients who have a burst of headache on the left side for a very long time cannot exclude the organic headache caused by intracranial tumor or intracranial occupancy.