I am a 19 year old female division 1 runner and I have been sick all year and no one has been able to identify what is wrong. The docs realize something is wrong, but can t identify what. Some of my symptoms include: stomach distention, pulsating around the navel, fatigue, rashes, headaches, puffiness, inflammation, and unexplained weight gain.
Since your an athlete there is a chance for u to develop herniation of your abdomen. The pulsating umbilicus is suggestive of loose abdominal muscle layer. Better to get a USG abdomen done. Get consult with a surgeon. N avoid harsh physical activity for a while.