Panic attacks cause sudden severe episodes of anxiety for no clear reason. Panic attacks usually cause hyperventilation. Those who suffer from panic attacks are usually completely calm in between attacks.

Common symptoms of panic attacks with hyperventilation include:

• Severe anxiety
• Hyperventilation:
• Breathing more than 30 breaths per minute
• Palpitations
• Tingling around the mouth
• Tingling in the fingers and the hands

Hyperventilation can lead to:

• Nausea
• Lightheadedness
• Fainting
• Cramping of the hands