<s>[INST] I am 25 weeks pregnant, 34 years old, 166 cm, and 75kg.  I have been experiencing sharp pains in my pelvic bone area almost everytime I stand up. It usually feels like I was hit in my pelvic area with a bat- throbbing and sore. Sometimes it feels like a nail is being driven into part of the bone.  It is very painful.  I have also noticed some swelling on the skin between my vaginal opening and rectum.  What can I do to ease this?  Is this normal? Should I be worried? [/INST] Though this is not normal but such pains do occur due to relaxation of joints when they bear weigh t during pregnancy. This occur under the influence of progesterone tjat is secreted in the body during pregnancy. Pelvic floor exercises, available easily on youtube on internet shall help. </s>