Would an ultrasound of abdomen show hernia? if you're testicles hang very low-stomach protrudes out when empty not overweight, signs of what? age 23

Unsure: If you have changes in your structure of the abdomen and testicles you need to be checked. Waiting can be very hazardous.

Yes: An ultrasound is a very good tool to detect hernias. If your concerned about your stomach protuberance go be evaluates by your md.

Physical Exam Best: A hernia is a hole in the abdominal wall through which the inner layer of the abdominal cavity stretches thru, creating a sac. The problem with ultrasounds (or even ct scans) is that they are usually done laying down; gravity and relaxation of the abdominal wall may allow the hernia to reduce and be missed. The best exam is done standing, with and without exertion. I recommend you see a surgeon.