My mom called a flight attendant to ask what "they" had for an upset stomach.

WSJ: Marisa Acocella Marchetto on the Flight Attendant From Hell | Traveler's Tale

All they are likely to do for a healthy person is cause an upset stomach.

CNN: What to do if you have the flu

Mrs Jones said she had been concerned about April on the day before she went missing because the little girl had complained of an upset stomach.

BBC: April Jones in the leisure centre

Bopara spent the day in bed yesterday with an upset stomach but played some good shots in his 60 and this sudden decision might yet prove the making of him.

BBC: Jonathan Agnew column

Test opener Wavell Hinds was originally ruled out of the match with an upset stomach but replaced off-spinner Omari Banks in the side after tea with the permission of the hosts.

BBC: Shivnarine Chanderpaul

Supposedly the science started in the 1850s when, in the lab of an English scientist, a dog that had been fed quinine bisulfate for an upset stomach urinated on a tray.

FORBES: As Clear As ...

The new "sufficient" standard will mean that the risk of someone becoming ill with an ear infection or stomach upset must not exceed 8%.

BBC: NEWS | UK | England | Devon | Concern over who pays for beaches

But an upset would be a bit more difficult to stomach than normal, since Federer has already taken Miami and Monte Carlo off his calendar.

WSJ: Paths Differ but Goals Same for Nadal, Federer