A 15-year-old boy developed back pain and sciatica after a minor trauma. Magnetic resonance imaging revealed lumbar spinal subdural hematoma. [ncbi.nlm.nih.gov]

Guest over a year ago Jan 2007 i got my Tap done in the ER. since then the lower back pain set in. so i got, 3 MRI's done, they found nothing. [steadyhealth.com]

It shouldn't be painful, but you may have a headache and some back pain for a few days. It's carried out in hospital by a doctor or specialist nurse. [nhs.uk]

Complications are infrequent, except for headaches and low back pain, but can be severe. Analysis of the cerebrospinal fluid must include a cell count and determination of the glucose and protein concentrations. [ncbi.nlm.nih.gov]

SLIDESHOW Low Back Pain: Symptoms, Causes, Treatment, Relief See Slideshow Medically Reviewed on 12/13/2019 References Kasper, D.L., et al., eds. Harrison's Principles of Internal Medicine, 19th Ed. United States: McGraw-Hill Education, 2015. [medicinenet.com]

[…] occur the presence of cancer of the CNS, multiple sclerosis, heritable mitochondrial disease, low blood pressure, low serum phosphorus, respiratory alkalosis, idiopathic seizures, traumatic brain injury, cerebral ischemia, brain abscess, hydrocephalus, hypocapnia [en.wikipedia.org]

Gram staining may demonstrate gram positive bacteria in bacterial meningitis.[24] Microbiological culture is the gold standard for detecting bacterial meningitis. Bacteria, fungi, and viruses can all be cultured by using different techniques. [en.wikipedia.org]