| • Poor pain control—Such as ischaemic heart disease, malignant infiltration | • Anaemia |
| • Hypoxia—May be episodic in both asthma and pulmonary embolus | • Hypoglycaemia |
| • Hypocapnia—May be due to occult bronchial hyperreactivity | • Hyperkalaemia |
| • Central nervous system disorders (structural or epileptic) | • Alcohol or drug withdrawal |
| • Vertigo | |
| • Thyrotoxicosis | |
| • Hypercapnia | |
| • Hyponatraemia | |
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