Pain is never a pleasant thing to experience. It is hard to ignore and chronic pain in specific can end up having a psychological impact affecting a person's mental as well as physical health. A list by the National Health Service (NHS) has revealed the 20 most painful health conditions to live with ranging from cluster headaches to shingles reported MyLondon. Each illness in the list causes pain so debilitating that it can prevent the sufferers from performing their day-to-day activities. Here's a list of those 20 excruciating illnesses. The list is in no particular order of severity of the pain or the seriousness of