Abdominal achiness is a common phenomenon during pregnancy and occurs due to the expansion of the uterus during pregnancy. Also known as round ligament pain they are symptomized by sharp achy pains or a dull throbbing in the lower abdomen. They occur because the uterus is growing and the ligaments around it must stretch to and thin out to be able to accommodate the increasing size. When the weight pulls these ligaments, you can feel the pain and they are usually accentuated...
...when you cough, suddenly get up, sit down or twist and move suddenly. It lasts just for a few moments for some women but can go on for longer periods for others. The increased blood flow and the increasing build up of the uterine lining to support the child can also cause these aches.
In case the achiness is accompanied by spotting, vaginal discharge, fever, chills or light headedness, you must consult your health care provider immediately as it could be the symptom of something serious. See also upper abdominal pain during pregnancy
If you are in your early months of pregnancy, severe lower abdominal achiness that goes on for several hours and is accompanied by vaginal bleeding is cause for concern as it may be an indication of an impending miscarriage. A brown colored vaginal discharge and pain on any one side of the lower abdomen is usually a sign of an ectopic pregnancy. Upper abdominal achiness during the later months of pregnancy accompanied by symptoms such as headaches, dizziness, nausea, vomiting, seeing spots or flashing lights and high blood pressure are signs of what is known as pre-eclampsia and requires immediate medical attention. In case the lower abdominal achiness is during the later stages of pregnancy either accompanied by or not by bleeding, this could be a sign of a separating placenta.
If it is just a sign of your uterus expanding, there is not much you can do except take it easy and keep your feet up during the day. Avoid quickly or sharply turning especially at the waist and when you do feel the pain bend a little toward it for some relief. If it is a gas pain, moving about the house and doing light chores will also help. Drink plenty of fluids particularly water and fruit juices to prevent dehydration and to ensure that your baby gets enough nutrients. A warm soak and shower or a hot water bottle placed over the belly should also provide you with some relief.