Overview

The goal of this observational study is to compare physical findings across three adult groups. Cervicogenic headache (CGH) is a headache linked to a problem in the neck. Neck pain may affect posture, muscle function, grip strength, and sensitivity to pressure. Researchers do not know whether CGH has a distinct pattern of these findings.

The main questions are:

• Do posture, grip strength, muscle stiffness, elasticity, and pressure sensitivity differ among the groups?
• Are any differences more closely associated with CGH than with neck pain?

Researchers will compare adults ages 25 through 60. One group will include people with CGH lasting at least three months. Another group will include people with neck pain lasting at least six months. People in the neck pain group will have no headaches. Healthy participants will have no neck pain or headaches.

Researchers will not provide treatment or change participants' usual care. Each participant will complete one study visit lasting about 15 minutes. Participants will:

• Answer short questions about their health and pain
• Stand while researchers measure their head and neck posture
• Squeeze a device that measures grip strength
• Complete brief tests of neck muscle stiffness and elasticity
• Tell researchers when applied pressure first becomes painful

Researchers will compare results across the three groups. The findings may guide future CGH assessment and treatment research.

Eligibility

• Inclusion Criteria:
• Aged 25 to 60 years
• Able to provide written informed consent
• Meeting the criteria for one of the following groups:
• Cervicogenic headache: physician diagnosis according to the International Classification of Headache Disorders, 3rd edition, with symptoms lasting at least 3 months
• Chronic nonspecific neck pain: neck pain lasting at least 6 months without headache
• Healthy control: no neck pain or headache

Exclusion Criteria:

• Receipt of physiotherapy for headache or neck pain during the previous 6 months
• Diagnosis of a headache disorder other than cervicogenic headache, including migraine or tension-type headache, or a diagnosis of trigeminal neuralgia
• History of cervical spine surgery or significant cervical trauma
• Current or previous diagnosis of a tumor or cancer
• Serious cardiovascular, cerebrovascular, hematological, metabolic, neurological, or psychiatric disorder
• Rheumatoid arthritis
• Congenital cervical abnormality
• Cervical spondylolisthesis or cervical instability
• Active infection
• Temporomandibular joint dysfunction
• Dizziness or visual disturbance accompanying headache
• Any clinical red flag suggesting serious cervical pathology
• Pregnancy or breastfeeding
• Upper-extremity injury, surgery, or another condition affecting handgrip strength
• Serious musculoskeletal disorder affecting cervical posture or muscle measurements
• Inability to complete the questionnaire-based or instrument-based assessments