What's a CSF Leak?

Cerebrospinal fluid (CSF) normally cushions the brain and spinal cord. When a tear or defect in the surrounding membrane lets CSF escape faster than it's replaced, the brain loses its buoyant support and settles lower in the skull — placing traction on pain-sensitive membranes, nerves, and blood vessels. That traction is what produces the hallmark headache described below.

Spontaneous (SIH)

  • No procedure caused it — usually a small spinal dural tear or a CSF-venous fistula

  • More likely with an underlying connective tissue disorder

  • Often takes much longer to diagnose than procedure-related leaks

Post-Procedure (PDPH)

  • Follows a lumbar puncture, spinal anesthesia, or epidural

  • Risk depends heavily on needle size and technique

  • Most cases resolve within one to two weeks

By the Numbers

~5/100k

estimated yearly incidence of spontaneous leaks

2:1

women affected more often than men

2 in 3

post-procedure headaches resolve within 1–2 weeks

The Hallmark Sign: Orthostatic Headache

The defining feature is a headache that follows gravity — it builds within minutes to hours of sitting or standing and eases when you lie flat. This pattern can fade with time, which is a common reason the diagnosis gets missed or mistaken for migraine.

  • Neck or upper-back stiffness, often felt between the shoulder blades

  • Nausea, tinnitus, or muffled hearing

  • Cognitive fog, light sensitivity, or unsteady balance

How It's Diagnosed

The ICHD-3 diagnostic criteria for headache attributed to spontaneous intracranial hypotension require all of the following:

All four criteria must be met:

  • A headache consistent with low CSF pressure, typically with a postural pattern

  • No procedure or trauma known to be capable of causing a CSF leak

  • The headache developed in relation to the leak, or led to its discovery

  • No better explanation from another diagnosis

Why Rehab Requires Care, Not Just Rest

Strict bed rest protects the healing membrane in the short term, but it comes at a cost — measurable cardiovascular deconditioning can set in within days. The goal of rehab is to thread that needle: protecting the leak site from pressure spikes (straining, heavy lifting, twisting, breath-holding) while rebuilding your tolerance for being upright and active before deconditioning becomes its own problem.

How We Approach Rehab

  1. Protect the healing site — avoiding heavy lifting, straining, and twisting during the active healing window, typically several weeks after diagnosis or treatment.

  2. Rebuild tolerance gradually — recumbent cycling, pool-based exercise, and gentle core work tend to be tolerated better than upright land-based activity early on.

  3. Treat the secondary tension — the neck, upper-back, and interscapular tightness that builds up from compensatory posture and time spent lying down.

  4. Progress back to full activity — a graded return to walking, upright tolerance, and eventually higher-level activity as symptoms allow.

Bottom line: Most post-procedure headaches resolve within one to two weeks; spontaneous leaks can take longer and sometimes need more than one treatment. The evidence guiding physical therapy here is still developing, so your plan will be built around protecting the healing site and your individual response — not a fixed script. With the right precautions and a graded return to activity, most people recover well.