Characteristics of Spinal (Post-Dural Puncture) Headache
The hallmark characteristic of spinal headache is a positional headache that worsens within 15 minutes of sitting or standing and improves within 15 minutes of lying flat, typically occurring within 5 days after a neuraxial procedure 1.
Core Clinical Features
Primary Symptom: Postural Headache
The defining feature is the orthostatic component - the headache dramatically worsens when upright and relieves when supine. This occurs because CSF leakage through the dural puncture site causes intracranial hypotension and compensatory venous dilation 1, 2. However, a critical caveat: approximately 6% of confirmed PDPH cases (8 of 142 patients in a large cohort) had no postural component, so its absence does not exclude the diagnosis 1.
Associated Symptoms
Beyond the headache itself, look for these accompanying features 1:
- Neck stiffness - very common
- Auditory symptoms - tinnitus or subjective hearing changes
- Visual disturbances - photophobia, blurred vision
- Vertigo or dizziness
- Nausea
- Pain in cervical, thoracic, or lumbar spine
Important clinical pitfall: 29% of PDPH patients experience headache alone without any of these associated symptoms 3. Do not dismiss PDPH simply because neck stiffness or auditory symptoms are absent.
Temporal Characteristics
Onset Timing
- Typically occurs within 5 days of the dural puncture (moderate certainty) 1
- Latency period ranges from 6 to 72 hours after the procedure 3
- Critical exception: Case reports document PDPH presenting more than 5 days post-procedure, even up to one year later 1, 4
Duration
- Traditionally described as resolving within 2 weeks spontaneously
- However, increasing evidence shows headaches can persist longer than 2 weeks and may become chronic 1, 5
- Duration when untreated ranges from 3 to 15 days 3
High-Risk Patient Characteristics
The 2023 multisociety consensus guidelines identify these patient factors with high certainty 1:
- Younger age (particularly 31-50 years: 11% incidence vs 4.2% in other ages) 3
- Female sex (11.1% incidence vs 3.6% in males) 3
- Previous history of PDPH (26.4% recurrence vs 6.2% in those without prior PDPH) - this carries a 4.3-fold increased risk 3
- History of chronic headaches or prior headaches (moderate certainty) 1
Procedural Risk Factors
The incidence varies dramatically based on the procedure 2:
- Spinal anesthesia with small-gauge atraumatic needles: <3%
- Unintentional dural puncture with large-bore Tuohy needles: 50-85%
- Dural puncture epidural techniques: 0.5-2%
Serious Complications to Monitor
PDPH is not merely a nuisance headache. Watch for these potentially severe complications 1:
- Subdural hematoma (SDH)
- Cerebral venous sinus thrombosis (CVST)
- Chronic headache syndrome
- Cranial nerve dysfunction
- Persistent backache
Diagnostic Approach
Suspect PDPH when headache or neurological symptoms that may be relieved when lying flat occur within 5 days of a neuraxial procedure (Grade A recommendation, high certainty) 1. The diagnosis is primarily clinical, based on detailed history and physical examination rather than imaging 1.
The International Headache Society's 2018 definition requires imaging evidence of low CSF pressure, but the 2023 consensus guidelines note this has significant limitations - neither opening nor closing CSF pressure reliably differs between PDPH patients and controls 1.