A headache that hits when you stand up is usually caused by a temporary drop in blood flow or fluid pressure inside your skull. In most cases, it’s related to something manageable like dehydration, low blood pressure, or muscle tension in your neck. Less commonly, it signals a leak of the fluid that cushions your brain. The pattern itself, pain that appears or worsens when you’re upright and improves when you lie down, is called a positional or orthostatic headache, and the specific cause determines what you should do about it.
Blood Pressure Drops When You Stand
The most common reason your head hurts when you get up is a temporary drop in blood pressure called orthostatic hypotension. When you go from lying or sitting to standing, gravity pulls blood downward into your legs. Normally your body compensates within a second or two by tightening blood vessels and increasing your heart rate. When that response is sluggish, blood pressure falls and your brain briefly gets less oxygen than it needs.
The resulting headache often concentrates in the back of your head and neck, sometimes draping across your shoulders in what doctors call a “coathanger” pattern. You might also feel dizzy, lightheaded, or briefly see spots. This tends to be worse first thing in the morning, after a hot shower, after a large meal, or when you’re dehydrated. Medications for high blood pressure, depression, or prostate problems can make it worse because they lower blood pressure further or slow the body’s ability to compensate.
Dehydration Makes It Worse
When you’re low on fluids, you have less blood volume overall. That makes the blood pressure drop upon standing more pronounced and harder for your body to correct. Dehydration may also cause headaches on its own by reducing the volume of fluid inside the skull, which stretches the membranes lining the brain, and those membranes are packed with pain-sensing nerves.
This is especially relevant if you wake up with a positional headache. You lose water through breathing and sweating overnight, and after six to eight hours without drinking, mild dehydration is common. Alcohol the night before compounds the effect. Restoring fluid volume is one of the simplest fixes: in one study, patients who hydrated well before a spinal procedure developed headaches at less than half the rate of those who didn’t (15% vs. 37%).
Your Neck May Be the Source
Not every headache triggered by standing up comes from inside the skull. Cervicogenic headache originates in the upper neck and is felt in the head, typically on one side. It’s driven by the way nerves from the top three vertebrae of your spine converge with the nerve that supplies sensation to your face and scalp. Pain signals from irritated neck joints, tight muscles, or stiff ligaments get misread by your brain as head pain.
The transition from sitting or lying down to standing changes the load on your cervical spine, and if you habitually carry your head forward of your shoulders (common after long hours at a desk or on a phone), that load is amplified. Forward head posture shortens the small muscles at the base of your skull, increases pressure on the upper cervical joints, and can sensitize the nerves that pass through the area. Over time, this can make even ordinary movements like standing up enough to trigger a headache. Improving your posture, stretching the muscles at the back of your neck, and strengthening the deep neck flexors at the front can reduce how often these headaches occur.
POTS and Rapid Heart Rate
Postural orthostatic tachycardia syndrome, or POTS, is an autonomic nervous system disorder where your heart rate jumps excessively when you stand, often by 30 beats per minute or more within the first 10 minutes. It’s most common in women of childbearing age. Headaches are a hallmark symptom: pooled data across 23 studies found that roughly 37% of people with POTS also meet the criteria for migraine.
The headache in POTS likely has more than one mechanism. Blood pooling in the legs reduces the amount returning to the heart and brain, which can lower the volume of cerebrospinal fluid and mimic the same kind of low-pressure headache seen in other conditions. Reduced blood flow to the muscles of the neck and shoulders may also contribute. If you notice your standing headaches come with a racing heart, palpitations, brain fog, nausea, or feeling like you might faint, POTS is worth discussing with your doctor. A simple tilt-table test or an active standing test can confirm or rule it out.
Cerebrospinal Fluid Leaks
Your brain floats in cerebrospinal fluid (CSF), a clear liquid that acts as a shock absorber. When that fluid leaks out, usually through a small tear in the membrane surrounding the spinal cord, the brain sags downward when you’re upright. This pulls on pain-sensitive structures and dilates blood vessels inside the skull to compensate for the lost volume. The result is a headache that can be severe, often described as a pressure or pulling sensation that dramatically improves within minutes of lying flat.
Spontaneous CSF leaks are uncommon but underdiagnosed. The headache typically worsens throughout the day as you spend more time upright and may come with nausea, neck stiffness, ringing in the ears, changes in hearing, or blurred vision. An MRI of the brain can show characteristic signs: the brain appears to sag, the membranes lining the skull light up with contrast dye, and the pituitary gland may look enlarged. At least one of three findings is needed for a diagnosis: low CSF pressure, visible evidence of a leak on imaging, or those distinctive MRI changes.
Initial treatment is conservative: bed rest, staying well hydrated, and caffeine. A dose of about 300 mg of caffeine (roughly two to three cups of coffee) has been shown to help relieve low-pressure headaches by constricting the dilated blood vessels inside the skull. If conservative measures don’t work, a procedure called an epidural blood patch can provide relief. A small amount of your own blood is injected near the spine, where it clots and seals the leak. Short-term relief rates are high, around 88%, though symptoms recur in some people and a repeat procedure or a more targeted approach may be needed.
When the Pattern Matters
Pay attention to how quickly the headache appears after you stand, how long it lasts, and what makes it better. A headache from low blood pressure usually hits within seconds to a minute of standing and comes with lightheadedness. A CSF leak headache may take 15 to 30 minutes of being upright to reach full intensity and is dramatically relieved by lying down. A cervicogenic headache may be triggered more by neck movement than by the standing itself and tends to stay on one side.
Certain accompanying symptoms raise the stakes. Seek prompt evaluation if your positional headache comes with vision changes, hearing loss on one side, a stiff neck with fever, new cognitive problems, or weakness in your arms or legs. A sudden, severe “thunderclap” headache that peaks within seconds is always an emergency, regardless of whether it’s positional. These features can point to bleeding, infection, or other conditions that need urgent imaging.
Practical Steps That Help
For the most common causes, simple changes make a real difference. Drink water before getting out of bed in the morning, and stay consistently hydrated throughout the day. Rise slowly: sit on the edge of the bed for 30 seconds before standing. If you tend toward low blood pressure, increasing your salt intake (unless you’ve been told to restrict it) helps your body retain fluid and maintain blood volume.
Strengthening the muscles that support your posture reduces cervicogenic triggers. Calf raises, leg crossing while standing, and compression stockings can all help if blood pooling is part of your problem. If caffeine helps your headache, that’s a useful clue that low intracranial pressure may be involved. And if positional headaches are a new, persistent, or worsening pattern rather than an occasional annoyance, getting a proper evaluation can rule out the less common but treatable causes like a CSF leak or autonomic disorder.