Hyperventilation syndrome (HVS) is a name given to a collection of physical and emotional symptoms, largely brought about by hyperventilation. This happens when we over-breathe.
The main signs of this are when we breathe much more quickly and more shallowly than our bodies needs. Over time, all sorts of physical changes can take place in our body. These include a decrease in carbon dioxide pressure in the alveoli (in our lungs) and arteries, an increase in arterial pH (respiratory alkalosis), constriction of cerebral arteries and increased production of lactic and pyruvial acid.