Final answer:
A stomachache may be considered serious when it disrupts a child's activity, affects their appetite, and causes gas or diarrhea.
Step-by-step explanation:
A stomachache may be considered serious when it disrupts a child's activity, affects their appetite, and causes gas or diarrhea. These symptoms can be indicators of an underlying health issue, such as food poisoning, gastroenteritis, or appendicitis. If a stomachache persists or worsens over time, it is recommended to seek medical attention to determine the cause and get proper treatment.
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