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The signs and symptoms of sudden illness can vary widely, but certain indicators are more commonly associated with such conditions. Changes in level of consciousness (LOC), nausea or vomiting, and loss of vision or blurred vision are all recognized symptoms that can occur in various sudden illness scenarios.

Bruising or rigidness of the abdomen, however, does not typically fall under the standard symptoms of sudden illness. While abdominal issues can manifest in sudden situations, presenting symptoms such as bruising or rigidity are often related to specific injuries rather than a broader category of sudden illness. This distinction is important because sudden illnesses often show a pattern of symptoms that reflect physiological changes in the body, rather than localized physical trauma indicators like bruising. Understanding this can help individuals differentiate between symptoms of sudden illness and those that may suggest an external injury.