What is a key neurological effect of hypoglycaemia?

A key neurological effect of hypoglycaemia is headache. When the body experiences low blood sugar levels, the brain, which relies heavily on glucose for energy, can be adversely affected. Insufficient glucose supply can lead to various neurological symptoms, one of which includes headaches. These headaches can occur due to the brain's response to the lack of energy, leading to altered neurotransmitter activity and potential irritation of the surrounding tissues.

Among the other symptoms listed, while hunger, increased blood pressure, and palpitations can occur during hypoglycaemia, they are more systemic responses rather than direct neurological effects. Hunger is a physiological reaction to low energy availability, while increased blood pressure and palpitations are more directly related to the body’s compensatory mechanisms under stress. These responses do not specifically denote a neurological effect as prominently as a headache does.