A chronically recurring headache caused by leakage of cerebrospinal fluid (CSF) into the epidural space; it worsens when a person stands and improves on lying down It is typically found in those with connective tissue disorders. The leakage of CSF limits the quantity of fluid in which the brain floats, drawing the brain toward the foramen magnum and base of the skull. Applying a blood patch to alleviate the leakage resolves the symptoms in most patients.