Hidden pain in the top of the left head may be a physiological phenomenon, but also may be the manifestation of certain diseases, such as hypertension, migraine, scalp neuritis, etc., should be timely consultation to identify the cause of the disease. 1. Physiological factors: work pressure, poor sleep quality and other factors may cause brain fatigue, causing nerve dysfunction and neurological headaches, which can lead to vague headaches. 2. Pathological factors (1) Hypertension: patients with severely elevated blood pressure levels can cause cerebral vascular spasm and vague pain symptoms, which may disappear after the blood pressure drops, and may be accompanied by dizziness, palpitations, fatigue, blurred vision and other symptoms. (2) Migraine: it is a chronic neurovascular disease, characterized by one or both sides of the headache, which is often vague at the beginning, and can gradually become throbbing pain, and mostly occurs on the side of the head, and can also involve the whole head, and can be combined with nausea, vomiting. It may be combined with nausea, vomiting, photophobia and other symptoms. (3) Intracranial tumor: It refers to the occupying lesion that occurs in the cranial cavity, because of the tumor occupying, cerebral edema, hydrocephalus can cause the intracranial pressure to increase, and thus the symptoms of headache can appear, which can be accompanied by vomiting, visual impairment and so on. In addition, the vague pain on the left side of the head may also be caused by mass compression, intracranial and extracranial infections and other diseases, but this symptom alone is not enough to diagnose the disease. It is recommended that the patient consult a doctor in time, complete the relevant examinations, ask the doctor to clarify the cause of the disease, and if necessary, carry out the appropriate treatment.