• Numeric Pain Rating scale [ Time Frame: Baseline, 1 hour, 48 hours, 4-weeks and 1-month follow-up ]
  Patients will be asked to indicate the intensity of their pain using an 11-point scale ranging from 0 ("no pain") to 10 ("worst pain imaginable").
• Headache Impact Test [ Time Frame: Baseline, 4-weeks and 1-month follow-up ]
  The Headache Impact Test is a 6 item self-report, questionnaire and the responses on all questions are summed to produce a total score ranging from 36 to 78, with higher scores indicating a greater impact of headache on daily life.
• Global Rating of Change Scale [ Time Frame: 48 hours, 4-weeks and 1-month follow-up ]
  Patients will be asked to rate their overall perception of improvement since beginning treatment on a scale ranging from -7 (a very great deal worse) to zero (about the same) to +7 (a very great deal better).
• Patient Acceptable Symptom State [ Time Frame: 4-weeks and 1-month follow-up ]
  The Patient Acceptable Symptom State (PASS) is used to define the level of symptoms beyond which patients consider themselves well. The PASS question: "Taking into account all the activities you have during your daily life, your level of pain, and also your functional impairment, do you consider that your current state is satisfactory?" with response options "yes" or "no".
• Active cervical range of motion [ Time Frame: Baseline, 1 hour, 48 hours, 4-weeks ]
  The active cervical range of motion (ACROM) assessment of the cervical spine will include flexion and extension in the sagittal plane, lateral flexion in the frontal plane and rotation in the transverse plane. A single inclinometer and Cervical Range of Motion Device will be used to collect ACROM.

• Numeric Pain Rating scale [ Time Frame: Baseline, 1 hour, 48 hours, 4-weeks and 1-month follow-up ]
• Head Impact Test [ Time Frame: Baseline, 4-weeks and 1-month follow-up ]
• Global Rating of Change Scale [ Time Frame: 48 hours, 4-weeks and 1-month follow-up ]
• Patient Acceptable Symptom Rate [ Time Frame: 4-weeks and 1-month follow-up ]
• Active cervical range of motion [ Time Frame: Baseline, 1 hour, 48 hours, 4-weeks ]

• Other: Thrust Mobilization
  Once therapist has assessed subject and has found the patients most comparable sign they will be performing a high velocity thrust at the end of the patients available range, as described by Maitland's Approach. The thrust will be performed only once. The therapist will perform either a localized cervical rotation thrust which primary movement is rotation or a longitudinal cephalad C1 and C2 thrust, both targeting the upper cervical spine
• Other: Non-Thrust Mobilizations
  Therapists will perform unilateral posterior to anterior mobilization (UPA) or central posterior to anterior (CPA) mobilizations grades I-IV as described above by Maitland concepts at levels C0-C3 which reproduce the patient's most comparable sign. Therapists will be instructed to perform 3x 30 second bouts of mobilizations at that level.

• Experimental: Cervical Thrust Mobilizations
  Once therapist has assessed subject and has found the patients most comparable sign they will be performing a high velocity thrust at the end of the patients available range, as described by Maitland's Approach. The thrust will be performed only once. The therapist will perform either a localized cervical rotation thrust which primary movement is rotation or a longitudinal cephalad C1 and C2 thrust, both targeting the upper cervical spine.
  Intervention: Other: Thrust Mobilization
• Active Comparator: Cervical Non-Thrust Mobilizations
  Therapists will perform unilateral posterior to anterior mobilization (UPA) or central posterior to anterior (CPA) mobilizations grades I-IV as described above by Maitland concepts at levels C0-C3 which reproduce the patient's most comparable sign. Therapists will be instructed to perform 3x 30 second bouts of mobilizations at that level.
  Intervention: Other: Non-Thrust Mobilizations

Inclusion Criteria:

1. Patient must be English-speaking and have appropriate medical literacy to participate in the study
2. The physical examination must yield a reproducible familiar/concordant neck, head, jaw symptom or dysfunction
3. Pain reports of at least 2/10 for a headache or neck pain intensity
4. Neck Disability reports of at least a 20% or greater impact
5. Patients that report having at least two headaches within one month

Exclusion Criteria:

1. The presence of any know red flags (i.e., tumor, metabolic diseases, RA, osteoporosis, prolonged history of steroid use, etc.)
2. Patients who exhibit any red flag symptoms: positive upper or lower motor neuron testing. Signs or symptoms consistent cervical myelopathy or radiculopathy with nerve root compression (muscle weakness involving a major muscle group of the upper extremity, diminished upper extremity muscle stretch reflex, or diminished or absent sensation to pinprick in any upper extremity dermatome
3. Patients who exhibit any red flag symptoms of cervical instability tests, or have a positive VBI or CAD testing, showing signs of the 5 D's (dizziness, drop attacks, dysarthria, dysphagia, diplopia) or patient who have signs of 3 N's (Nystagmus, nausea, other neurological symptoms).
4. Prior surgery to the cervical spine or head (including cerebral shunts)
5. Women who are pregnant in their third trimester