Which of the following is a common symptom of hypoglycemia?

Sweating is indeed a common symptom of hypoglycemia. When blood sugar levels drop to a level that is too low, the body's response includes the activation of the sympathetic nervous system. One of the physiological responses to this activation is increased sweat production. This reaction is part of the "fight or flight" response, where the body prepares itself to address a perceived threat, which in cases of hypoglycemia, is the need to restore normal blood sugar levels.

While nausea, excessive thirst, and fatigue may occur in other contexts, they are not as characteristic of hypoglycemia specifically as sweating is. Nausea can arise from various conditions affecting the gastrointestinal system or due to stress, excessive thirst is more commonly associated with dehydration or diabetes, and fatigue may result from many factors unrelated to blood sugar levels. In contrast, sweating is a direct response to the hypoglycemic state, making it a more accurate indicator of this condition.