Lower back pain is not a disc slipping out of place. An assessment looks at what the back is being asked to carry, how long it holds one position, and what else in the week is loading it.
A neck that stiffens through the working day is usually carrying a load rather than an injury, and working out what is loaded is what the first visit is for.
Posture gets blamed for a great deal of pain, and the research has not settled whether it causes low back pain, so an assessment here looks at the whole shape of your day: how long you hold a position, and how little you move in between.
A headache that starts at the base of the skull and builds through a working day is worth having your neck looked at, though the headache alone cannot tell you where it started.
Leg pain that starts in the back usually means a nerve is irritated, not that something has slipped out of place.