The abdomen, colloquially known as belly, tummy or tum, was an area of the humanoid body located under the chest. It contained the stomach, with which the term had been known to interchange with.

When Blon Fel-Fotch Passameer-Day Slitheen, in the skin suit of Margaret Blaine, took Cathy Salt to the ladies toilets to kill her, she noted her "little tum" was "complaining" when she farted loudly. (TV: Boom Town)

Having been absorbed by the Abzorbaloff, Colin Skinner's face was embedded in the left side of the Abzorbaloff's abdomen. (TV: Love & Monsters)

Fiddling with an Adipose Industries pendant, Donna Noble inadvertently induced parthenogenesis in Stacy Campbell, causing her stomach to rumble as a newborn Adipose to protude from her abdomen. (TV: Partners in Crime)

When Rose Noble demonstrated to the Meep that her stuffed animals were not alive, by pulling out some of its stuffing, the Meep wailed fearfully that "[she] pulled its tummy out". (TV: The Star Beast ^[+]Russell T Davies, adapted from Doctor Who and the Star Beast (Pat Mills and John Wagner), Doctor Who 2023 specials (BBC One and Disney+, 2023).)