There are many causes of pain in the upper left side of the head, and the common causes are mainly the following: First, vascular neuropathic headache, mainly manifested as a side or bilateral temporal paroxysmal headache, mostly accompanied by visual aura symptoms, with a sense of vascular pulsation, mostly seen in patients with high mental stress, overexertion, and frequent late nights, can take Ciprolin capsules, Tianma headache tablets to improve the symptoms. Second, trigeminal neuralgia, considered to be caused by nerve demyelination changes, mainly manifested as a side of the head needle-like or knife-like pain, pain does not exceed the midline, lasting from a few seconds to a few minutes, can apply antiepileptic drugs, such as carbamazepine, oxcarbazepine and other symptomatic treatment. Thirdly, herpes zoster, which is considered to be caused by herpes virus infestation, will not only cause pins and needles-like pain on one side of the head, but its skin has characteristic clustered blistering rash, and treatment requires the application of acyclovir therapy, which can be combined with the application of nerve-nourishing drugs, such as methylcobalamin and adenosylcobalamin.