WHO Definition of work-related musculoskeletal disorders 2:
	• Many others are less well defined: – E.g. myalgic conditions involving pain, discomfort, numbness and tingling sensations throughout the neck shoulders, upper limbs and lower back. – These types of disorder, that are sometimes called non-specific WMSDs, often cannot be diagnosed with respect to a clinical pathology but they may still result in physical impairment and disability.