NHS warning as red flag sign in eyes could be a symptom of diabetes
![NHS warning as red flag sign in eyes could be a symptom of diabetes](https://i2-prod.walesonline.co.uk/incoming/article29696153.ece/ALTERNATES/s615/2_GettyImages-495855517.jpg)
In extreme cases this symptom can go on to cause complete vision loss if not treated promptly.
In extreme cases this symptom can go on to cause complete vision loss if not treated promptly.