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Haemosiderosis: focal or general increase in tissue iron stores without associated tissue damage.

HbA1c: Glycosolated haemoglobin is a blood test to determine level of glycaemic control.

HDL cholesterol: Commonly referred to as the "good" cholesterol as it reduces fatty deposits (atheroma) in arteries.

Hydration: the absorption of or combination with water.

Hyperglycaemia: High blood glucose levels exceeding normal limits of 8 mmol/l.

Hyperkeratosis: thickened skin or toe nail.

Hyperlipidemia: elevated blood lipids (fats).

Hypertension: elevated blood pressure.

Hypertrophy: Enlargement of organ or tissue due to enlargement in cell size.

Hypoglycaemia: diminished levels of glucose in the blood.

Hypoglycaemic incidents: episodes of low blood glucose levels of which symptoms are experienced.

Hypoglycaemic symptoms: vary among individuals but common symptoms include: shaking, cold or clammy sweat, dizziness, headache, slurred speech, tingling in lips or fingertips, confusion etc.