Causes
Hyperventilation syndrome is believed to be caused by psychological factors and by definition has no organic cause. It is one cause of hyperventilation with others including infection, blood loss, heart attack, hypercapnia or alkalosis due to chemical imbalances, decreased cerebral blood flow, and increased nerve sensitivity may also underlie this symptom.
In one study, one third of patients with HVS had "subtle but definite lung disease" that prompted them to breathe too frequently or too deeply.
Many people with panic disorder or agoraphobia will experience HVS. However, most people with HVS do not have these disorders.
Read more about this topic: Hyperventilation Syndrome