Luna:

"athological reason of low blood glucose level is either deficiency of or total absence of insulin in the blood."

That is incorrect.

Dear,

see these links:

http://www.medtech.edu/blog/hyperglycemia-vs-hypoglycemia

https://www.bd.com/us/diabetes/hcp/pdf/difference-blood-sugar.pdf

Glycaemia [or Glycemia] -->  refers to  the level of 'glucose in a person's blood'

Euglycaemia -->  means normal amount of glucose is present in one's blood. (i.e. blood glucose is within normal limits.)

Dysglycaemia --> means the level of glucose in blood is in the abnormal range.

Hyperglycaemia --> is a dysglycaemia where the glucose level in blood is higher than normal.

When the blood glucose levels are persistently high and progressively increase (i.e. chronic hyperglycaemia), it is termed diabetes mellitus. [ Remember- there is also a stage called Pre-diabetes between normoglycaemia and diabetes].

Sometimes, in stressful conditions like in an injury or surgery, the blood glucose may transiently rise up and 'may' return to normal once the stress is over (i.e. acute). This is called Stress hyperglycaemia.

Hypoglycaemia - is a dysglycaemia where the blood glucose level is lower than normal.

Hypoglycaemia can occur in an otherwise normal person when he does not take food for a long time or when he does heavy physical activity. It is manifested by sweating, palpitations, irritability, increased hunger,  confusion, etc.

Hypoglycaemia is more commonly encountered in a diabetes patient when he is taking anti-diabetic drugs. This can be due to various reasons like skipping of meals, over dose of drugs, renal failure etc.

Sabeeh ur Rehman,

As a teacher of nutritional terminology I will define for you both terminologies. A typical medical terminology consisting of 3 parts; prefix (the beginning of  a term), root (stem of the term), suffix (the end of a term). Therefore both terminologies hypo-hyper/glycemia have the three parts.

Hypoglycemia:  hypo (prefix) means low, glyc (root) means sugar, and emia (suffix) means blood. All means low blood sugar. Do the rest Hyper ( prefix) means high .....

What do think about euglycemia? right ..normal blood sugar. if you gonna to follow British spelling do like this; Hypoglycaemia, hyperglycaemia, auglycaemia.

Best regards

Aly R Abdel-Moemin

Please take a look at these useful links.

https://www.quora.com/What-is-the-difference-between-Hypoglycemia-and-Hyperglycemia

https://www.quora.com/How-do-hyperglycemia-and-hypoglycemia-differ

Hyperglycemia occurs when people with diabetes have too much sugar in their bloodstream. Hyperglycemia should not be confused with hypoglycemia, which is when blood sugar levels go too low. You should aim to avoid spending long periods of time with high blood glucose levels.