08 / Post-concussion & TBI

Why Do Post-Concussion Headaches Feel Like Pressure? Intracranial Fluid Hydrodynamics

Cranial Solutions8 June 20256 min read

Post-concussion headaches often feel like an intense "vise-like" pressure around the head, which is associated with altered fluid dynamics inside the skull and dural membrane tension. When a head impact restricts the sphenoid bone and upper neck joints, it may reduce the sphenobasilar pump that helps circulate cerebrospinal fluid (CSF). Because the brain produces around 400 to 600 mL (up to 1 litre) of fresh CSF a day inside a space of about 150 mL, restricted drainage may raise resting pressure against the stiff dural lining (28-86 MPa). This stretch may stimulate trigeminal dural pain receptors, associated with persistent pressure headaches.

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The Biomechanical Problem: A Fluid Backup Inside a Fixed Container

The skull works like a semi-closed hydraulic system. Inside it, three components share a fixed total volume: brain tissue, blood and cerebrospinal fluid (CSF).

From Restriction to Pressure Headache

Step 1: Sphenoid and upper neck restriction.
Step 2: Reduced sphenobasilar fluid pumping.
Step 3: CSF production outpaces slowed drainage.
Step 4: Increased stretch on the stiff dura (28-86 MPa).
Step 5: Trigeminal pain receptor activation, associated with vise-like pressure.

After a concussion, headaches may take on a distinct "pressure" quality because of fluid dynamics:

Continuous CSF production: the choroid plexus produces fresh CSF continuously, around 400 to 600 mL (up to 1,000 mL in broader literature) every 24 hours.
Slowed outflow: sphenobasilar restriction and suboccipital myodural bridge tension may create a bottleneck at the base of the skull, slowing CSF drainage into the dural venous sinuses.
Dural membrane stretch: as fluid builds behind the bottleneck, it may press against the dural lining. Because dura is stiff (28-86 MPa), even small pressure increases may create noticeable stretch.

See how these drivers are assessed on our Post-Concussion Symptoms & TBI page.

Comparison: Vascular Migraine vs. Pressure-Type Post-Concussion Headache

Pain quality

Classic vascular migraine: Throbbing, pulsing, one-sided pain.
Post-concussive pressure headache: Constant, both-sided vise-like pressure or tight band.

Primary mechanism

Classic vascular migraine: Cortical spreading depression and blood vessel dilation.
Post-concussive pressure headache: Reduced CSF clearance and dural membrane stretch.

Structural driver

Classic vascular migraine: Functional neurovascular sensitivity.
Post-concussive pressure headache: Restricted sphenoid and upper neck joints.

Trigger factors

Classic vascular migraine: Foods, hormonal shifts, sensory overload.
Post-concussive pressure headache: Head movement, exertion, sustained postures.

Fluid state

Classic vascular migraine: Normal overall CSF circulation.
Post-concussive pressure headache: Slowed daily CSF turnover and glymphatic stasis.

Feature	Classic vascular migraine	Post-concussive pressure headache
Pain quality	Throbbing, pulsing, one-sided pain.	Constant, both-sided vise-like pressure or tight band.
Primary mechanism	Cortical spreading depression and blood vessel dilation.	Reduced CSF clearance and dural membrane stretch.
Structural driver	Functional neurovascular sensitivity.	Restricted sphenoid and upper neck joints.
Trigger factors	Foods, hormonal shifts, sensory overload.	Head movement, exertion, sustained postures.
Fluid state	Normal overall CSF circulation.	Slowed daily CSF turnover and glymphatic stasis.

How Fluid Stasis Is Associated With Pressure Headaches

The brain's dural lining is richly supplied with pain fibres from the ophthalmic branch of the trigeminal nerve (CN V1) and the upper neck nerves (C1-C3). When fluid dynamics are disrupted:

Dural Pain Receptor Activity

Fluid pressure stretching the dural membrane may stimulate dural pain receptors, sending ongoing signals to the brainstem.

Neck-to-Head Pain Spread

Ongoing dural strain may sensitise the trigemino-cervical nucleus, so headaches spread from the base of the skull over the head to the forehead and eyes.

Flares With Exertion

Physical activity increases blood flow into the head. If CSF drainage is restricted, exertion may cause quick pressure rises, associated with throbbing headache flares.

Head pressure that worsens with exercise or bending since a knock? Read more on our Post-Concussion Symptoms & TBI page.

Supporting Movement and Fluid Dynamics

Easing pressure-type headaches involves supporting normal fluid drainage:

Endonasal inflation (Nasal RX): controlled, brief inflations within key inner nasal passageways apply gentle pressure that aims to mobilise the sphenovomerine sutures and support sphenobasilar joint motion.
Upper neck care: addressing C1/C2 alignment aims to ease myodural bridge tension around the fluid drainage gateway at the base of the skull.
Supporting daily fluid turnover: improved fluid circulation aims to lower resting dural tension and support normal CSF renewal. Individual results vary.

Frequently Asked Questions

Why does my post-concussion headache feel like a tight band around my head?

This vise-like feeling is associated with dural membrane tension and fluid pressure. When a concussion slows CSF drainage, fluid may press outward against the stiff dural lining, stimulating pain nerves across the head. Learn more on our Post-Concussion Symptoms & TBI page.

Why do my headaches get worse when I exercise or bend over?

Exercise increases blood flow into the head. Normally excess fluid drains away easily. If a concussion has restricted sphenobasilar pumping or upper neck drainage, extra blood flow may cause a fluid backup, raising pressure on the dural lining. Read How Does Brain Fluid Flow and Why Does a Concussion Stop It?

How might endonasal inflation help with head pressure?

Nasal RX uses gentle, brief inflations that aim to mobilise restricted facial and cranial sutures around the sphenoid bone, easing dural tension and supporting sphenobasilar joint mobility and fluid drainage. Suitability is discussed after individual assessment.

For the full overview, visit our Post-Concussion Symptoms & TBI page.

Also see Why Does the Base of My Skull Always Feel Tight?

Compare with migraine on our Migraines & Headaches page.

Learn about our clinical approach.

Browse the published studies on our Research page.

References

01Gard A, Vedung F, et al. (2023). Cerebrospinal fluid levels of neuroinflammatory biomarkers in athletes with persistent post-concussive symptoms. PubMed, 18(1): 45-52.
02Dura Mater & Migraines Synthesis Report (2025). Biomechanical stiffness (28-86 MPa) and dural mechanics.
03StatPearls: Post-Concussive Syndrome (2024). Pathophysiology and cerebral blood flow changes. NCBI Bookshelf / NIH.
04NIH / PMC Fluid Production Review (2024). Mechanisms of cerebrospinal fluid production and turnover dynamics. PMC / NIH, 11071066.
05Levy D. (2009). Meningeal neurogenic inflammation, dural mast cell degranulation, and CGRP. Curr Pain Headache Rep, 13(3): 237-240.
06Mayo Clinic Suture Study (2020). Cranial suture headache syndrome originating from sutural trigeminal nociceptors. Mayo Clin Proc, 95(7): 1420-1428.

Learn how our non-surgical endonasal protocol is used to evaluate suitability for conservative management, and how cranial base structural mechanics guide an individual care plan.