Effects of Thoracic Spine and Cervical Spine Mobilization on Pain, Functional Disability, and Quality of Life in Patients With Mechanical Neck Pain.

Inclusion Criteria: Participants of both genders aged between 20 and 40 years with a clinical diagnosis of mechanical neck pain will be included in the study. Eligible participants must have a history of neck pain lasting more than 4 weeks (subacute to chronic) and demonstrate mild to moderate functional disability, defined by a Neck Disability Index (NDI) score between 10% and 50%. Exclusion Criteria: Participants will be excluded if they present with signs or symptoms of cervical radiculopathy or myelopathy, such as a positive Spurling's test accompanied by neurological deficits, dermatomal numbness, or myotome weakness. Individuals with a history of cervical spine fracture, dislocation, or spinal surgery, as well as those with inflammatory, infectious, or neoplastic spinal conditions, will also be excluded. Additional exclusion criteria include diagnosed osteoporosis or prolonged use of systemic corticosteroids, severe cervical spine instability or vertebrobasilar insufficiency, recent trauma to the cervical or thoracic spine within the past 6 months, presence of systemic neurological disorders, pregnancy, and current participation in another physiotherapy or clinical trial for neck pain.