Pain is not normal! It is you body's way of telling you something is not optimal. Sometimes it is not clear and takes a bit to decipher what your body is trying to tell you but pain doesn't just happen. Your body is super intelligent and it is not wasteful. If it is bothering to send messages of pain to your brain - it is asking you to stop and work out why.
Sometimes pain is straight forward - you sprained your ankle so you are getting pain messages. They are warning you not to use it or put too much weight on it to prevent further damage while it heals.
Sometimes pain is a little less predictable. Abdominal pain may be because you ate something your body did not like, it may be because you are anxious and that is how your body chooses to feel it for some reason, there may be something more sinister going on inside your abdomen. A bloating, nagging tummy ache is never normal. It may be nothing major but it is still telling you there is something your body would like you to take care of be it eliminating a certain food, eating more greens, learning how to destress or any number of other things.
Pain in your shoulder could be because you hurt it playing sport or overusing it, because you just had abdominal surgery and that can result in referred pain to your shoulder, your neck or shoulder may be subluxated, your gallbladder may be sending pain there because you have gallstones or you may have been sitting at a desk or computer too long and the muscles have become tired of that position and are suggesting you move before they start to become damaged even just at a microlevel.
The moral of this story is that your body is infinitely intelligent. If it is sending you pain messages - take the time to stop and listen to it and try to work out why. If you can't work it out - see your health care practitioner - GP, naturopath, chiropractor, myotherapist, psychologist etc and ask for help. Sometimes you just need a bit of help interpreting the messages and that is what we are here for.
Giving you my honest opinion on all things health related. Keeping it real and from the heart.