Hyperventilation

Hyperventilation is rapid or deep breathing, usually caused by anxiety or panic. This overbreathing, as it is sometimes called, may actually leave you feeling breathless.

When you breathe, you inhale oxygen and exhale carbon dioxide. Excessive breathing may lead to low levels of carbon dioxide in your blood, which causes many of the symptoms that you may feel if you hyperventilate.

Rapid deep breathing; Breathing - rapid and deep; Overbreathing; Fast deep breathing; Respiratory rate - rapid and deep

Feeling very anxious or having a panic attack are the usual reasons that you may hyperventilate. However, rapid breathing may be a symptom of an underlying disease, such as a heart or lung disorder, bleeding, or an infection. (See rapid shallow breathing.)

Your doctor will determine the cause of your hyperventilation. Rapid breathing may be considered a medical emergency -- unless you have experienced this before and have been reassured by your doctor that your hyperventilation can be self treated. (See below.).

Often, panic and hyperventilation become a vicious cycle -- panic leads to rapid breathing while breathing rapidly can make you feel panicked.

If you frequently overbreathe (sometimes referred to as hyperventilation syndrome), this may be triggered by ongoing emotions of stress, anxiety, depression, or anger. However, hyperventilation from panic is generally related to a specific fear or phobia, such as a fear of heights, dying, or closed-in spaces (claustrophobia).

If you have hyperventilation syndrome -- that is, if you regularly hyperventilate -- you might not be aware of it. But you will be aware of having many of the associated symptoms, including dizziness or lightheadedness, shortness of breath, belching, bloating, dry mouth, weakness, confusion, sleep disturbances, numbness and tingling in your arms or around your mouth, muscle spasms in hands and feet, chest pain, and palpitations.

• anxiety and nervousness
• stress
• panic attack
• situations where there is a psychological advantage in having a sudden, dramatic illness (for example, somatization disorder)
• stimulant use
• lung disease such as asthma, chronic obstructive pulmonary disease (COPD), or pulmonary embolism (blood clot in the lung)
• infection such as pneumonia or sepsis
• cardiac disease such as congestive heart failure or heart attack
• severe pain
• bleeding
• drugs (such as an aspirin overdose)
• pregnancy
• ketoacidosis and similar medical conditions