Headaches caused by low intracranial pressure are considered to be due to low pressure in the cerebrospinal fluid. When the cerebrospinal fluid pressure is measured below 60 mmH2O, it can be called hypocranial pressure, and hypocranial pressure can cause headache. The most common clinical cause is excessive cerebrospinal fluid retained during lumbar puncture, and the patient can develop this hypocranial pressure headache. There is a clear correlation between low cranial pressure headache and posture, as the headache is severe when the patient stands up or moves around. When lying down or resting, the headache can disappear. Secondly, hypocranial pressure headache can also be clinically associated with reduced cerebrospinal fluid secretion due to vasodilatory dysfunction, for which the patient should be given the appropriate medication. For headache caused by low intracranial pressure, it can also be seen in patients with dehydration, diabetic ketoacidosis, and severe systemic infections, which can lead to a decrease in the production of cerebrospinal fluid, and patients with low cranial pressure headache.