Why turning your head hurtsStrong evidence
Neck pain is very common: up to 80% of adults have it at some point, an NHS trust says, and "difficulty turning your head or looking up or down" is one of its usual symptoms. The NHS lists the commonest causes as the neck becoming locked in an awkward position while sleeping, long spells sitting at a desk, a pinched nerve and an injury such as whiplash.
Most neck pain isn't serious. NHS inform says it's "rarely caused by any serious disease or damage". The Chartered Society of Physiotherapy (CSP) says that in most cases the exact cause can't be identified, but the most likely one is a strain of one of the small joints on the side of the neck, the facet joints. Discs are less often involved, and nerves less often still.
Sources 1, 2, 3, 4
The small joints at the side of the neck: what the tests showEmerging evidence
Clinicians check these joints by tipping the head back and turning it, which is one reason turning can bring the pain on (our reading). In 125 people referred to a pain clinic, a set of checks that included that movement picked out facet joint pain fairly well (a specificity of 84%), but it hasn't yet been tested in other groups. In 500 people with long-lasting spinal pain at one US pain practice, 55% of those with neck pain had facet joint pain on anaesthetic blocks, and single blocks gave false results 63% of the time.
These are selected clinic groups, and only a block can confirm the source, so for everyday neck pain the honest wording is "often the small joints", not a firm diagnosis. It doesn't change the first treatment.
Sources 5, 6, 4
A wry neckStrong evidence
A wry neck (acute torticollis) is a neck that locks, usually overnight or over a few hours: "the head is tipped to one side, while the chin is turned to the other", because the muscles are in spasm, an NHS trust's emergency department leaflet says. It's a common cause of neck pain in young people, and it often follows an unusual sitting or sleeping position, a long spell at a computer, or carrying a heavy or unbalanced load.
X-rays usually aren't needed. Patient information says it usually improves within 24 to 48 hours but can take up to a week, and most people don't get it again. Both sources advise gentle movement, painkillers and heat, and patient information says not to use a soft collar, which "can actually worsen and prolong the stiffness".
Sources 7, 8, 2
A trapped nerve, whiplash, neck arthritis and headachesStrong evidence
A trapped nerve (cervical radiculopathy) gives sharp arm pain, pins and needles or numbness, often brought on by turning or tipping the head towards the sore side. Clinicians use that movement as a test: in a review of 6 studies, it was fairly good at confirming a trapped nerve but missed many (in most of the studies it was positive in only 30 to 50% of people who had one), and no single test was good at both. In one study of 82 people, a combination of four examination findings was far more convincing than any single test, though the estimate was imprecise. Our pinched nerve guide covers it.
Whiplash gives "neck stiffness and difficulty moving your head" after a crash, a fall or a sports injury, and symptoms can take several hours to start; it usually gets better within 2 to 3 months, the NHS says. Neck arthritis (cervical spondylosis) is common over 40, comes and goes, and is "a normal part of ageing", and many people with it have no symptoms. A one-sided headache that starts at the back of the head and is brought on by neck movement can come from the neck itself (cervicogenic headache), with reduced neck movement as one of its signs.
Sources 9, 10, 11, 12, 13
Clicking, scans and what they meanStrong evidence
Clicking and grinding as you turn your head are common: NHS inform says they "can sound alarming" but are "not usually serious".
Scans are "rarely needed and usually do not change treatment", an NHS trust says, partly because they find changes in most people without any pain. In 1,211 people with no neck symptoms, magnetic resonance imaging (MRI) showed bulging discs in 87.6%, including about three quarters of people in their 20s. The CSP adds that spondylosis on an X-ray isn't strongly linked with pain, so a scan report on its own doesn't explain why your neck hurts.
Sources 3, 1, 14, 4
After an injury: who needs a scanStrong evidence
After a fall or crash, clinicians decide who needs neck imaging with the Canadian C-spine rule, which the National Institute for Health and Care Excellence (NICE) uses. Being 65 or over, a dangerous fall or crash, or tingling in the arms or legs means imaging. With only low-risk features, someone who can turn their neck 45 degrees to the left and right can be cleared without a scan. In the study that built the rule, in 8,924 adults, it picked up every one of the 151 important neck injuries.
It's a clinician's rule, not a self-test. After a neck injury, call 999 if the person is unresponsive, has severe neck pain or can't move their head, or fell from a height such as 5 or more stairs, NHS inform says.
Sources 15, 16, 17
Dizziness when you turn your headStrong evidence
The commonest causes of vertigo (a spinning feeling) are inner-ear problems, the NHS says, including benign paroxysmal positional vertigo (BPPV), "where specific head movements cause vertigo". Its advice is to move your head carefully and slowly, and not to stretch your neck, for example while reaching up to a high shelf. The NHS lists vertigo with double vision or loss of vision, hearing loss, trouble speaking, or weakness, numbness or tingling in an arm or leg as a 999 emergency. NHS inform says contact a GP about neck pain with blurred vision, ringing in the ears or dizziness.
Rarely, a torn neck artery causes neck pain, sometimes with dizziness. In 279 people with one, head or neck pain was the commonest symptom (80.6%), it was usually unlike any headache they'd had before (75.4% of those who'd had headaches), and it rarely eased with their usual painkillers (14.7%). Physiotherapists' international framework says these artery problems are rare but can be recognised from the story. That's why neck pain with numbness, weakness, a drooping face, double vision, or trouble speaking or balancing is a 999 call.
Sources 18, 3, 19, 20
How it usually goesStrong evidence
A wry neck usually eases within a few days to a week. Most new neck pain improves within 6 to 8 weeks, an NHS trust says, and NHS inform says the biggest change comes in the first couple of weeks; the CSP says most neck pain problems get a lot better within three months. Whiplash usually gets better within 2 to 3 months.
Neck pain often comes back: the CSP says about half of people have another episode, and in population studies between half and three quarters of people with neck pain reported it again 1 to 5 years later. Younger people tend to do better, and psychological and social factors predicted the course more than physical findings did. A flare isn't a sign of damage, and no one can promise a date.
Sources 8, 1, 3, 21, 11, 4, 22