It's pretty normal to get pain in your chest sometimes... but do you know what it means? And what about when your knee starts hurting? From the common ailments and injuries that pain us all to the rarer aches that might indicate a serious disease, watch to improve your knowledge of your body, and know what to look out for in case you need to take a trip to hospital...

This probability comparison/comparison video is based on relevant sources and community discussions. All numbers and facts listed might not be up to date, valid, or in any specific order.

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