Why do some people need medical lumbar puncture needle puncture even for headaches?

Lumbar puncturezh (hereafter referred to as lumbar puncture) is a procedure in which a needle is inserted between the 3rd and 4th lumbar vertebrae of the patient. Two to three milliliters of cerebrospinal fluid is extracted from the subarachnoid space for laboratory testing. The subarachnoid space is the space between the brain and spinal cord and the skull and spinal canal that surrounds them. The subarachnoid space of the brain and spinal cord are connected. The cerebrospinal fluid, which is filled with fluid, totals about 150 milliliters and is produced and absorbed daily, circulating continuously and in dynamic balance. The cerebrospinal fluid is generated by the blood circulation through the villi-like lining of the ventricles (called choroid) and the endothelial cells of the capillaries in the brain. Therefore, for brain and spinal cord lesions. In particular, early inflammatory diseases* can show abnormalities by examining the cerebrospinal fluid. Many diseases of the brain and spinal cord (inflammation, tumors, etc.) can affect changes in the nature of the cerebrospinal fluid, such as meningitis, in which the number of cerebrospinal fluid leukocytes increases to a small degree, resulting in different changes in their appearance. Epidemic cerebrospinal meningitis has the highest cell count. The appearance of the cerebrospinal fluid is cloudy and rice-like; the sugar and chloride content in the cerebrospinal fluid of tuberculous meningitis and fungal meningitis is significantly reduced. The respective pathogenic bacteria can be found in the smear. It can be seen that lumbar puncture examination of the cerebrospinal fluid is irreplaceable for the diagnosis of certain brain and spinal cord pathologies with any modern advanced examination.