A burst of pain on the left side of the brain like a pinprick, the common clinical causes are trigeminal neuralgia, vascular headache, occipital neuralgia and so on. 1. Trigeminal neuralgia: this disease refers to the recurrent transient paroxysmal pain confined to the trigeminal innervation area, which is usually associated with organic lesions inside and outside the brain, such as tumors in the neighboring areas, trauma, inflammation, etc. Clinical manifestations include paroxysmal, electric shock-like, knife-like pain in the trigeminal innervation area, as well as facial convulsions, redness and so on. 2. Vascular headache: this disease is related to emotional abnormalities, poor lifestyle, cerebrovascular disease and other factors, the head of the diseased population vasodilatation dysfunction and cerebral cortex dysfunction, the clinical manifestations of one or both sides of the head paroxysmal throbbing pain, drilling pain, distension and so on. 3. Occipital neuralgia: this kind of pain symptoms mainly exists in the back of the scalp, usually with the neck nerve compression, such as chronic neck muscle tension, head or neck injuries, etc., the clinical manifestation of the back of the scalp unilateral or bilateral paroxysmal tear-like or needle-like pain. If the pain persists and is not effectively relieved, neurosurgery is recommended.