It was further suggested that traditional exercises were hyperpressive, leading to increased intra-abdominal and pelvic cavity pressures.

Once the voluntary signal to defecate is sent back from the brain, the abdominal muscles contract (straining) causing the intra-abdominal pressure to increase.

Delivery also leads to increased intra-abdominal pressures.

Relaxation due to intra-abdominal pressure is another proposed explanation, which would make abdominal compression the primary mechanism.

Any exertion that increases intra-abdominal pressure, such as coughing, sneezing, or sporting activity can cause pain.

Raised intra-abdominal pressure (e.g. in pregnancy or obesity) predisposes to regurgitation.

Those that do occur in children are more likely to be associated with a connective tissue disorder or with conditions that increase intra-abdominal pressure.

Coughing or activities that increase intra-abdominal pressure may cause leakage of stool.