Headache is a common phenomenon in daily life and also a common clinical symptom. The most common cause of left-sided headache with a pang is dermatomyositis caused by scalp cold or viral infection. In this case, hot compresses can be applied, and if necessary, pain-relieving drugs such as Nimesulide capsules and ibuprofen extended-release capsules can be applied. Nerve nourishing drugs such as methylcobalamin can be applied. Apply antiviral drugs, such as ribavirin. The left side headache may be caused by high blood pressure, poor rest and excessive stress. Pay attention to rest and reduce mental stress. You can apply pain-relieving drugs and give symptomatic treatment. For headache caused by high blood pressure, take antihypertensive drugs on time to control blood pressure. If the pain symptom is heavy and the attack time is long, it is necessary to do cranial CT or cranial magnetic resonance examination to exclude intracranial organic lesions such as intracranial occupational lesions, vascular lesions and intracranial infections. To sum up, the left side headache, which comes in bursts, may be caused by dermatomyositis, migraine, intracranial organic lesions, etc. It is necessary to identify the cause and give active treatment for the cause.