The gut talks to the doctor, but very quietly. Gurgles and rumbles last fractions of a second and easily get lost among the sounds of the lungs and heart. A stethoscope catches only a fraction, so the diagnosis depends on the experience and hearing of the individual doctor. The SonicGuard wearable sensor, placed on the abdomen, listens continuously and records every whisper.
Then the algorithm takes over. First, it identifies moments in the recording where the sound energy spikes: these are candidates for bowel sounds. Then a transformer neural network, trained on spectrograms (images showing how sound frequency changes over time), decides whether it is truly a bowel sound or interference. The model was trained on manually labeled recordings from 40 people and tested on 43 new ones.
This approach gives the doctor not a subjective "something is rumbling" but an objective picture of bowel activity. You can compare recordings before and after meals, monitor recovery after surgery, or assess the effect of medications. The sensor never gets tired or distracted: it listens to the abdomen as no human ever could.
Bowel sounds are called "borborygmi," from a Greek word that imitates the rumbling itself.
In the TV series "Star Trek," the tricorder could diagnose diseases from body sounds — SonicGuard takes the first step in that direction.