Which symptom is unique to ingested toxins?

The symptom that is unique to ingested toxins is a stomach ache. This symptom is directly related to the gastrointestinal effects of consuming harmful substances, which can irritate the stomach lining or cause other digestive disturbances. When toxins are ingested, the body often experiences localized discomfort as it tries to process and eliminate the harmful substances.

Ingested toxins commonly lead to symptoms such as nausea, vomiting, and abdominal pain, which are significant indicators of gastrointestinal distress specifically caused by such toxins. Hence, stomach ache is not just a general symptom but distinctly associated with ingested toxins.

The other symptoms listed, such as dizziness, difficulty breathing, and weakness, can be attributed to a wider range of medical issues and are not exclusive to the ingestion of toxins. They might occur due to various physiological responses or conditions unrelated to toxin ingestion, highlighting the unique nature of a stomach ache in this context.