Which of the following is an indication for administering oral glucose?

Administering oral glucose is primarily indicated in cases of hypoglycemia, which is a condition characterized by abnormally low blood sugar levels. When a patient presents with symptoms of hypoglycemia, such as confusion, weakness, sweating, or fainting, providing oral glucose will help rapidly increase their blood sugar level, alleviating the symptoms and preventing further complications. This intervention is crucial in managing hypoglycemia, especially in diabetic patients who may experience such episodes due to excess insulin or inadequate carbohydrate intake.

The other options, while they may present in various medical situations, do not qualify as direct indications for oral glucose administration. Hypotension can be due to numerous factors and does not specifically relate to blood sugar levels. Severe headache could stem from various causes, including migraines, dehydration, or other underlying conditions, and does not justify oral glucose treatment unless hypoglycemia has been confirmed. Lastly, administering glucose in the case of seizures without checking blood sugar is inappropriate, as not all seizures are due to low blood sugar; other underlying causes need to be addressed first to avoid complications.