Sudden blurred vision.

Have you ever had the sudden sensation of seeing as if you were underwater? Sometimes it’s fatigue, but if blurred vision comes on suddenly and doesn’t go away, it could be a warning sign of something more serious. It could indicate diabetes, high blood pressure, or even a transient cerebrovascular accident (mini stroke).

For example, diabetes can damage the blood vessels in the retina (diabetic retinopathy), which can affect vision. If this symptom lasts more than 24 hours, it is time to see a specialist.

2. Yellow eyes (jaundice).