The devastating effects of band on us (:

Insults to your body, in the form of physical stresses, chemical stresses, or emotional stresses can "blow fuses" and irritate the nervous system. This causes abnormal signals to reach the tissues, organs, and glands.

Let's break down these types of stresses and how they relate to musicians:

Physical stresses: Bad posture while playing your instrument, prolonged playing times without breaks, playing in one position (sitting for example) for a long time, quickly ramping up practicing times due to an upcoming gig or recital, being out of shape & overweight, sitting at computers for a long time, playing computer games hour after hour.

Chemical Stressors: drugs and alcohol, prescription drugs, fast food, vaccines, toxic chemicals, bad water supply.

Emotional stressors: getting that recording contract, composing and finishing songs by a deadline, record company execs being a pain is the ***, family stresses, relationship stressors, job stresses other than your music career, death of loved ones, relocating, being on tour without family or loved ones nearby, and finally your negative thinking ("stinkin' thinkin")

I bet you never thought that all these things mentioned have a direct impact on your body!

Continued physical, chemical, and emotional stressors will short-circuit your nervous system and lead to things called "spinal subluxations". "A spinal what?" you ask? A subluxation is a misalignment of a spinal bone(s) that exerts stress on your nerve system. This leads to malfunction of the tissues that affected nerves supply, in some cases muscles, in some cases organs, and in some cases, both!
These continued stressors will eventually lead to symptoms due to repeated stress on the nerve system. Prolonged, uncared for stresses will lead to disease, disability, and eventually a shortened life-span.

WARNING: Ever see what a spinal cord injury does to a person? That's a pure example of a deadened nerve system.

The above information is taken from http://www.musicianshealth.com/whyrsi.htm but i bold the words myself :D