4. Pain in your back or chest
Intuitively, when a part of your body hurts, that means there is something wrong with that part of your body, right? Chest pain means a problem in your chest, leg pain a problem in your leg, and so on. However, few people are aware of the existence of what is called referred pain, which is pain that we feel is a part of our body but is actually caused by a problem in a different part of our bodies.
For example, people having a heart attack sometimes feel pain on their left arm, when the problem is clearly the heart. This happens because pain signals travel towards the brain through shared nerves, and sometimes the brain can misinterpret where the signal actually comes from. If you have gallbladder problems you could feel pain, but not in your abdomen, but in your chest or your right shoulder blade.