Why Labour Hurts 1

From the feedback I have received regarding pain free labours it seems that people are just too brainwashed by society to believe. OK, but I refuse to give up.
The uterus is basically a bag of smooth muscle. It is very similar in its design to the stomach. They both have three layers of smooth muscle each. These layers work together when contracting and relaxing. The stomach to churn up food and drink to digest it and the uterus to open the cervix and push a baby out.
Have you had anything to eat today? OMG you must be in agony if the smooth muscle in your stomach is contracting. Did you send for an ambulance and get rushed to hospital for an epidural? No. Why not? From what people have told me, when smooth muscle contracts it produces pain. If this is correct then every time you eat you must be in pain.
Smooth muscle is not designed to cause pain when it contracts under normal conditions. Simple. Then why does uterine smooth muscle seem to cause so much pain when it starts to contract with most labours?
See my next post for the answers.