Labour pains are actually contractions of muscles of uterus (womb) . It is because of these muscle contractions pain is felt (similar to cramp in our leg muscles) . It is because of these Contractions the baby is pushed down in birth passage and pressure is generated on the mouth ofthe uterus which now begins to open. This gives positive signals to brain to generate more contractions thus increasing intensity, duration and frequency of contractions. With this pain experienced by the lady also increases. This finally results in delivery of the baby.
Experience of delivery and pain experienced by the lady is unigue for her. The intensity of pain felt by her depends on many factors like position & weight of the baby, shape & size of her pelvis, her own mental reaction to pain & its intensity, her own tolerance. Some are just fearful about the pain, some are not ,All this makes the experience unigue for her. It is difficult to predict how one will tolerate the pain at that moment. It is beneficial to prepare oneself by improving one’s stamina and strength of muscles by doing exercise even before pregnancy. You can also do some Breathing exercises and practice some Relaxation techniques also.
As mentioned earlier delivery pains are due to contractions of muscles of uterus. Normally these muscles do relax after each contraction and this helps to maintain good, blood flow towards the uterus and baby. So when labour pains are natural, regular and co-ordinate, they don’t affect baby and mother. But if they are beyond tolerating capacity of the mother, she gets tired and exausted , some times her heart-rate, blood pressure may increase It can cause increased stress on heart in a woman with known heart disease. There are some attentive methods to ease / reduce the pain , like hot fomentation, massage, Relaxing body muscles, Breathing exercises (like Lamaze technique ) ? Hypnotherapy, Aromatherapy, Hydrotherapy etc.