What symptom might indicate a need for a sonogram in an adult?

The symptom that indicates a need for a sonogram in an adult is abdominal pain. This is because abdominal pain can stem from a variety of conditions that affect the internal organs, such as gallstones, appendicitis, or other gastrointestinal issues. A sonogram, or ultrasound, is particularly useful in visualizing soft tissues and organs, allowing healthcare providers to assess for abnormalities, fluid accumulation, or masses within the abdominal cavity. This non-invasive imaging technique helps in diagnosing the underlying causes of abdominal pain, which may require further investigation or intervention.

Other symptoms listed, such as headaches, chest pain, and skin rashes, might require different forms of assessment or imaging, but abdominal pain is most directly linked to the need for a sonogram due to the range of potential complications that can be identified through this imaging method.