Conventional drugs will be prescribed in an individually-tailored, pragmatic method with reference to most frequently used treatments in patients with a primary diagnosis of cervical sprain/strain group, cervical disc disorder with radiculopathy group, or cervicalgia according to Korean Health Insurance Review and Assessment (HIRA) 2014 statistics.

Physical therapy will be prescribed in an individually-tailored, pragmatic method with reference to most frequently used treatments in patients with a primary diagnosis of cervical sprain/strain group, cervical disc disorder with radiculopathy group, or cervicalgia according to Korean Health Insurance Review and Assessment (HIRA) 2014 statistics.

In pain measurement using NRS, patients are asked to rate their pain by selecting a number from 0 to 10 that best represents their pain severity between the anchors of 0 which indicates 'no pain', and 10 which indicates 'worst pain possible'.

In pain measurement using NRS, patients are asked to rate their pain by selecting a number from 0 to 10 that best represents their pain severity between the anchors of 0 which indicates 'no pain', and 10 which indicates 'worst pain possible'.

The NDI evaluates functional impairment and is a 10-item questionnaire developed to assess the level of disability due to neck pain. Each item is graded into 6 levels, each representing a score of 0-5. Higher scores indicate greater limitation relating to neck pain.

The NPQ evaluates functional impairment for the past 3 days in this study and is a patient reported outcome of subjective neck pain and pain reduction. The NPQ is a 9-item questionnaire developed to assess the level of disability due to neck pain. Each item is graded into 5 levels, each representing a score of 0-4. Higher scores indicate greater limitation relating to neck pain.

PGIC grades the level of subjective improvement into 7 levels (1, very much improved; 2, much improved; 3, slightly improved; 4, no change; 5, slightly worse; 6, much worse; and 7, very much worse).

Pain upon movement in cervical range of motion (ROM) will be assessed.

EQ-5D is a tool developed for health-related quality of life (HRQoL) assessment, and is widely used in the health care sector. Scores range from -1, 'health worse than death' to 1, 'perfect health'. EQ-5D-5L has 5 dimensions covering current health status and functionality: mobility (M), self care (SC), usual activities (UA), pain/discomfort (PD), and anxiety/depression (AD), to be rated out of 5 grades (1, no problem; 2, slight problem; 3, some/moderate problem; 4, severe problem; 5, extreme problem).

EQ-VAS uses a vertical 10cm line labeled at each end with scale anchors. EQ-VAS is used to indicate the patient's health state and patients are asked to mark a point that represents their health state between the anchors of 'worst health state' and 'best health state imaginable'. Scores are recorded in millimeters with a total range of 0-100 millimeters.

SF-12 is a simplified version of SF-36. SF-12 assesses health-related quality of life (HRQoL) across 8 domains with 1-2 items per domain: physical functioning, role-physical, bodily pain, general health, vitality, social functioning, role-emotional, and mental health. Higher scores indicate better HRQoL.

Economic evaluation of medical costs will be performed to assess cost-effectiveness of the 2 groups.

Economic evaluation of time-related costs will be performed to assess cost-effectiveness of the 2 groups.

Economic evaluation of lost productivity costs will be performed to assess cost-effectiveness of the 2 groups.

The credibility and expectancy questionnaire will be used to assess treatment expectation on a 9-point Likert scale. Participants will be asked to select an answer to the following questions on their first visit of Week 1 (1='not at all'; and 5='somewhat'; to 9='very much'): "How much do you expect that treatment will alleviate your symptoms during the study period?"

Drug type and dose of prescription for medicine or rescue medicine (acetaminophen), and type and frequency of other treatments (e.g. physical therapy, injections) will be recorded.

Physicians will monitor and record any unexpected or unintended patient reaction to Chuna or usual care at each visit. Adverse events (AEs) associated with Chuna will include, but not be limited to, AEs anticipated from previous reports of manual therapy, and will stay open to all possibilities taking into consideration other potential, unknown AEs.