Hello and thank you for the question! If your symptomes continue after long periods of time, during your everyday activity, it probably might be a sign of umbilical hernia. Have you ever noticed a lump in or near the your belly button? The umbilical hernia is caused by the weakness in the muscle of your abdomen wich may lead to the internal part of the body, like intestines to pull out through you belly botton. I would suggest you to taka an appointment with a general surgeon for further evaluation and do an Abdominal Ultra Sound for further findings. Best Regards!