Which of the following conditions is always considered unstable?

Hypoglycemia is indeed considered an unstable condition due to its potential to lead to rapid deterioration if not promptly addressed. When a patient experiences low blood sugar levels, it can result in a variety of critical symptoms such as confusion, seizures, loss of consciousness, and even coma. The body's ability to function properly is compromised, making timely intervention essential.

In contrast, stable angina generally is characterized by chest pain that occurs predictably with exertion and is relieved by rest or medication. It is a stable condition that allows for planned management.

Electrolyte imbalances can vary in severity and impact, and while some may indeed be acute or critical, not all electrolyte imbalances are immediately life-threatening, meaning they do not always present the same level of instability as hypoglycemia.

Chronic Fatigue Syndrome involves persistent fatigue and other symptoms that can wax and wane but does not lead to immediate life-threatening scenarios. It's typically managed over a longer period, focusing on supportive care.

In summary, hypoglycemia is consistently classified as unstable due to its acute nature and the risk of rapid clinical decline if corrective measures are not taken quickly.