Respiratory Alkalosis: Symptoms, Causes, and Treatment
Updated: 2 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: September 2026
TL;DR
Respiratory alkalosis occurs when your blood pH rises above 7.45 because you are breathing too rapidly (hyperventilating) and exhaling excessive carbon dioxide. While often triggered by anxiety or fever, it can also signal serious underlying conditions like sepsis or a pulmonary embolism. Treatment focuses on addressing the root cause, such as managing stress or treating an infection, to restore the body's natural acid-base balance.
Quick Answer
What is Respiratory Alkalosis?
Respiratory alkalosis is a condition where your blood becomes too alkaline (pH above 7.45) due to low levels of carbon dioxide. This typically happens when you hyperventilate, causing your lungs to expel more CO2 than your body produces. It is the opposite of respiratory acidosis and can be caused by a wide range of factors, including panic attacks, pregnancy, fever, or mechanical ventilation issues.
MEDICAL EMERGENCY: WHEN TO SEEK IMMEDIATE CARE While respiratory alkalosis itself is often not dangerous, it can be a sign of a life-threatening emergency. Seek immediate care or call 911 if you experience: • Seizures or loss of consciousness. • Altered mental state or severe confusion. • Cyanosis (blue tint to the skin, lips, or nails). • Severe, unexplained weakness.
What is Respiratory Alkalosis?
Respiratory alkalosis is a disturbance in the body's acid-base balance that occurs when the blood's pH level rises above the normal range of 7.35 to 7.45. This shift happens when there is a significant decrease in the concentration of carbon dioxide (CO2) in the blood, usually caused by hyperventilation or over-breathing.
The body maintains its pH through a delicate coordination between the lungs, kidneys, and a natural buffering system. When you breathe too quickly, your lungs release CO2 faster than your cells produce it. Because CO2 acts as a mild acid in the blood, losing too much of it causes the blood to become excessively basic, or alkaline.
Symptoms and Warning Signs
The symptoms of respiratory alkalosis are often related to the rapid drop in CO2 levels and the subsequent shift in blood chemistry.
Symptom | Description |
Dizziness & Lightheadedness | A feeling of instability or spinning, often during rapid breathing. |
Paresthesia | Numbness or a "pins and needles" tingling sensation, usually in the hands, feet, or around the mouth. |
Confusion | Difficulty thinking clearly or feeling disoriented. |
Chest Tightness | A feeling of pressure or discomfort in the chest, which can mimic other conditions. |
Fatigue & Nausea | General feelings of tiredness or stomach upset as the body struggles to maintain balance. |
What Causes Respiratory Alkalosis?
Anything that triggers hyperventilation can lead to respiratory alkalosis. These causes are generally categorized into conditions that affect the brain's respiratory center or conditions that cause the body to struggle for oxygen.
Brain and Nervous System Triggers
The part of your brain that controls breathing can be stimulated by various factors, leading to excessive exhalation of CO2:
Anxiety and Panic Attacks: The most common emotional triggers for hyperventilation.
Physical Pain and Fever: Natural stressors that increase the breathing rate.
Head Injuries or Tumors: Physical damage to the brain's respiratory control centers.
Medications: Excessive use of certain drugs, such as aspirin (salicylates).
Systemic and Respiratory Conditions
In some cases, the body hyperventilates as a reaction to an underlying physical illness:
Sepsis and Liver Failure: Severe systemic infections or organ dysfunction that disrupt metabolism.
Pregnancy: Hormonal changes that naturally increase the breathing rate.
Lung Diseases: Conditions like pneumonia, pulmonary embolism (blood clot), or pulmonary edema (fluid in the lungs) that cause hypoxia, prompting the body to breathe faster to compensate for low oxygen.
Diagnosis and Testing
Healthcare providers primarily diagnose respiratory alkalosis using an Arterial Blood Gas (ABG) test. This test measures the exact levels of oxygen, carbon dioxide, and pH in the blood to confirm the alkalosis and determine if it is respiratory or metabolic in nature.
Other diagnostic tools include:
Pulse Oximetry: A non-invasive finger clip that measures blood oxygen levels.
Pulmonary Function Tests: To evaluate how well the lungs are moving air.
Imaging: Chest X-rays or CT scans to look for underlying lung infections or blood clots.
Blood Panels: Basic metabolic panels (BMP) to check electrolyte levels and kidney function.
How is Respiratory Alkalosis Treated?
Treatment focuses almost entirely on identifying and correcting the underlying cause of the hyperventilation. Respiratory alkalosis itself is rarely dangerous; however, the root cause can be.
Acute Management
For immediate relief of hyperventilation caused by anxiety or stress, simple breathing techniques can help:
Paper Bag Breathing: Breathing into a paper bag allows you to re-inhale some of the CO2 you've exhaled, helping to restore blood levels.
Guided Breathing: Slowing down the breath through conscious effort or coaching.
Clinical Interventions
When an underlying medical condition is present, targeted treatments are required:
Infections: Antibiotics for pneumonia or sepsis.
Blood Clots: Anticoagulants (blood thinners) for a pulmonary embolism.
Mechanical Ventilation: Adjusting the settings on a ventilator if the machine is causing the patient to breathe too quickly.
Medication: Anti-anxiety medications for those who experience frequent panic-induced alkalosis.
Conclusion
Respiratory alkalosis is a clear signal that the body's delicate acid-base balance has been disrupted by over-breathing. While the symptoms like tingling and dizziness can be frightening, the condition is usually resolved once the underlying trigger, whether it be a panic attack, fever, or a more serious infection, is properly managed.
Next Steps
If you frequently experience symptoms of hyperventilation or dizziness, consult your healthcare provider to rule out underlying lung or metabolic issues. Managing stress through relaxation techniques and staying up-to-date on vaccinations can also help reduce your risk of respiratory infections that lead to alkalosis.
Frequently Asked Questions
1. Is respiratory alkalosis dangerous?
On its own, it is usually not dangerous. However, it can be a symptom of a very serious condition like sepsis or a blood clot in the lung, which requires immediate medical attention.
2. Why does my face and hands tingle when I hyperventilate?
When CO2 levels drop, your blood pH rises, which can cause calcium levels in your blood to shift. This often leads to the "pins and needles" sensation known as paresthesia.
3. Can anxiety cause respiratory alkalosis?
Yes. Anxiety and panic attacks are among the most common causes of hyperventilation, which directly leads to respiratory alkalosis.
4. What is the difference between alkalosis and acidosis?
Alkalosis is when your blood pH is too high (above 7.45). Acidosis is when your blood pH is too low (below 7.35).
5. How does a paper bag help?
Breathing into a paper bag traps the carbon dioxide you just exhaled, allowing you to breathe it back in and raise your blood's CO2 levels.
6. Can pregnancy cause me to breathe faster?
Yes. Hormonal changes during pregnancy often cause a slight increase in the breathing rate, which can lead to mild respiratory alkalosis.
7. What is an ABG test?
An Arterial Blood Gas (ABG) test is a blood draw from an artery (usually in the wrist) that provides precise measurements of oxygen, CO2, and pH levels.
8. Can aspirin cause respiratory alkalosis?
Yes. An overdose or excessive use of salicylates (like aspirin) can stimulate the brain's respiratory center, causing you to breathe too fast.
9. What is hypoxia?
Hypoxia is a condition where your body or a specific region of your body is deprived of adequate oxygen supply. This often triggers hyperventilation.
10. How does the liver affect breathing?
Liver failure can lead to the buildup of toxins that stimulate the brain's respiratory center, causing the body to over-breathe.
11. Is respiratory alkalosis the same as hyperventilation?
Hyperventilation is the action of over-breathing. Respiratory alkalosis is the chemical result in your blood caused by that action.
12. Can a head injury change my breathing?
Yes. If the injury affects the part of the brain that controls the respiratory rhythm, it can cause irregular or excessively fast breathing.
13. Does smoking increase my risk?
Yes. Smoking and nicotine use can damage the lungs and increase the risk of infections or blood clots, both of which can lead to alkalosis.
14. What are the signs of a serious breathing emergency?
Emergency signs include blue skin or lips (cyanosis), confusion, seizures, or fainting.
15. Can mechanical ventilators cause this?
Yes. If a ventilator is set to deliver breaths too frequently or at too high a volume, it can cause the patient to lose too much CO2.
Learn More
Trusted external resources: American Lung Association, the National Heart, Lung, and Blood Institute (NHLBI), and Mayo Clinic.
Medical Disclaimer: This article is for informational purposes only and does not constitute medical advice. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read in this article.
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