The majority of people have some form of postural dysfunction. If however the dysfunction only causes minimal tissue irritation then the person may not have any pain experience. It is however still of benefit to improve posture as prevention is better than simply waiting for things to get worse before taking corrective action.
Posture is not just a static position, it is a persons posture during activities as well as at rest. Lifting, bending, sitting, carrying shopping and walking are common activities; but how many people perform these tasks with good postural alignment?
Based on the fact that 80% of the population have varying degrees of back pain, it would indicate that not many people move well.
With the presence of a pain experience associated with back movements / positions, but at the exclusion of any significant medical pathology, it is unlikely that your problem will require medical intervention. That does not mean there is nothing wrong; it means your back is unhappy and requires your attention to make postural improvements.
Important additional note:
A growing problem is the development of postural dysfunction with pain sensitisation. This is a problem when a person has a pain syndrome which means their immune and neural system will transmit pain impulses at very low levels of tissue irritation. It is still important for the person to optimise their posture and movement, but also essential for them to understand their pain experience will be much worse and understandably it makes compliance to exercises more difficult.
Warning: Please note that over use pain medication can eventually make a person even more sensitised to minor tissue irritation. Clinically it is becoming more common to see a person with minor mechanical irritation who is taking high levels of pain medication. This is a difficult process to break and can have a devastating effect on the persons quality of life, therefore MSK 360 would emphasize the importance of early health focused intervention as opposed to becoming reliant on pharmacology.