There is no current consensus among biologists on the questions of how sex in Eukaryotes arose in evolution, what basic function sexual reproduction serves, and why it is maintained, given the basic two-fold cost of sex.
Excessive production of gas by bacteria is a common cause of intermittent abdominal bloating/distention. Bacteria can produce too much gas in three ways. First, the amount of gas that bacteria produce varies from individual to individual.
Bladder distension is a medical condition in which the bladder is stretched. This is usually due to urinary retention, in which the patient is unable to urinate, but it can be artificially induced by doctors in order to conduct tests for interstitial cystitis.