Which of the following is a common symptom of poisoning that supportive care aims to alleviate?

Supportive care in the context of poisoning primarily focuses on alleviating symptoms and managing complications associated with toxic exposures. Nausea and vomiting are significant symptoms in many cases of poisoning due to the irritant effects of the toxin on the gastrointestinal tract, as well as the body's natural response to remove harmful substances.

In emergency medicine, addressing nausea and vomiting can help stabilize the patient and improve comfort while other treatments are administered, such as antidotes or activated charcoal. Managing these symptoms is essential, as they can lead to dehydration, electrolyte imbalances, and further complications if not properly addressed.

Although headache, fatigue, and high blood pressure can also occur in various poisoning scenarios, they are often less immediate concerns compared to nausea and vomiting, which can directly influence the patient's overall condition and require prompt intervention. Therefore, nausea and vomiting is recognized as a common symptom of poisoning that supportive care specifically targets for relief.