Overbreathing and Hyperventilation: Symptoms, Causes and When It Is an Emergency
What overbreathing (hyperventilation) feels like, why it happens, the medical causes that must be ruled out, and when it is an emergency. Information only, no ways to induce it.
Content last updated . This page has not been medically reviewed.
Urgent first
Rapid breathing that starts for the first time may be a medical emergency, MedlinePlus says, and you should be taken to the emergency room right away. [1] In the US, call 911 for chest pain, severe difficulty breathing, blue or grey lips or skin, or if you are not sure. [2][3] Contact a clinician if you are in pain, have a fever or are bleeding, or if the overbreathing continues or worsens. [1]What it is
Hyperventilation is rapid and deep breathing, also called overbreathing, and it may leave you feeling breathless. [1] You breathe in oxygen and breathe out carbon dioxide; breathing too much leaves a low level of carbon dioxide in the blood, and MedlinePlus says this causes many of the symptoms. [1]This page explains the symptoms and causes only. It gives no way to bring overbreathing on, and you should not try to produce it.
Symptoms
MedlinePlus lists these. You may not notice the fast breathing itself but you are likely to notice the other symptoms. [1]| Symptom | Source wording |
|---|---|
| Head and thinking | Feeling lightheaded, dizzy, weak or not able to think straight |
| Breath | Feeling as if you cannot catch your breath |
| Heart and chest | Chest pain or a fast, pounding heartbeat |
| Hands, feet, face | Muscle spasms in the hands and feet; numbness and tingling in the arms or around the mouth |
| Other | Belching or bloating, dry mouth, problems sleeping |
The NHS also lists "breathing too quickly, trembling hands, pins and needles" as a pattern that can point to hyperventilation, and says not to self-diagnose. [4]
Causes
MedlinePlus separates two groups. [1]- Emotional causes: anxiety, nervousness, a panic attack and stress.
- Medical causes: bleeding, heart problems such as heart failure or heart attack, some medicines, infections such as pneumonia or sepsis, ketoacidosis (usually due to diabetes), lung disease such as asthma, COPD or pulmonary embolism, pregnancy, severe pain and stimulant medicines.
This is why the cause should be decided by a clinician, not guessed. MedlinePlus says your provider will examine you for other causes. [1] The NHS lists a panic attack among common causes of shortness of breath, but also says sometimes it signals something more serious, and not to self-diagnose. [3]
Hyperventilation syndrome and breathing pattern problems
MedlinePlus says people who frequently overbreathe may have a condition called hyperventilation syndrome. [1] A 2024 review describes breathing pattern disorder as altered breathing that cannot be fully attributed to organic causes at the current time, diagnosed through questionnaires, clinician observation and objective testing. [5] If you think this describes you, see dysfunctional breathing and breathing pattern disorders.Evidence for retraining: low quality. A 2025 systematic review of 68 studies (2,119 participants) of non-drug treatments for dysfunctional breathing found breathing retraining was the most reported approach and "showed positive effects" in many studies, but most studies had a high or unclear risk of bias and the authors rate the evidence for efficacy low quality. [6] That is a statement about supervised clinical retraining, not about self-taught exercises.
What a clinician may do
At an office visit the provider will examine you and may order blood tests, an ECG, chest imaging or lung scans. [1] MedlinePlus notes that a provider may sometimes ask you to breathe in a certain way to reproduce symptoms and watch how you breathe. [1] That is a clinical assessment and is not something to copy at home.If a clinician has said anxiety or panic is the cause
MedlinePlus says that if your provider has said your hyperventilation is due to anxiety, stress or panic, there are steps you can take at home. [1] One is calm reassurance from a friend or family member in a soft, relaxed tone. Another is pursed-lip breathing, which it describes as puckering your lips as if blowing out a candle, then breathing out slowly through your lips. [1] It also suggests seeing a mental health professional if you have been diagnosed with anxiety or panic, and practicing relaxation techniques. [1]Stop any exercise and return to normal breathing if you feel dizzy, tingly or faint; see dizziness, tingling and fainting during breathing exercises. To tell overbreathing from panic or a heart problem, see hyperventilation, panic attack or medical emergency.
Where this fits
Overbreathing is one reason this library treats forceful or very fast breathing practices with caution. The overview is at breathwork safety.Frequently asked questions
What does hyperventilation feel like?
MedlinePlus lists lightheadedness, dizziness, feeling unable to catch your breath, chest pain or a pounding heartbeat, and numbness and tingling around the mouth or in the arms. [1]
Is hyperventilation always caused by anxiety?
No. MedlinePlus lists medical causes including bleeding, heart problems, infection, lung disease and diabetes-related ketoacidosis. [1]
When is hyperventilation an emergency?
When rapid breathing happens for the first time, MedlinePlus says it may be a medical emergency. [1] Chest pain and severe breathing difficulty also need urgent help. [3]
Can I treat it at home?
Only if a provider has already said anxiety, stress or panic is the cause; MedlinePlus then describes calm reassurance and slow pursed-lip breathing. [1]
Is there good evidence for breathing retraining?
For dysfunctional breathing, a 2025 review found low-quality evidence for efficacy. [6]
References
- MedlinePlus Medical Encyclopedia, Hyperventilation. U.S. National Library of Medicine. Review date 7/23/2024. Read 2026-10-22.
- MedlinePlus Health Topics, Heart Attack. U.S. National Library of Medicine. Read 2026-10-22.
- NHS, Shortness of breath. Page last reviewed 30 January 2024. Read 2026-10-22.
- NHS, Pins and needles. Page last reviewed 4 January 2024. Read 2026-10-22.
- Milstein CF et al. Breathing pattern disorder: introduction and diagnostics. Immunol Allergy Clin North Am 2025. PubMed 39608873. Read 2026-10-22.
- Bondarenko J et al. Nonpharmacological interventions for dysfunctional breathing in adults: a systematic review. J Allergy Clin Immunol Pract 2025. PubMed 40345332. Read 2026-10-22.