If you are asking what stage of COPD you have, the short answer is that COPD is graded into four stages: mild, moderate, severe and very severe. Your clinician places you in one based on breathing tests, your symptoms and how often flare-ups happen. Stage 4, the very severe stage, is the most advanced one, and there is no stage 5 in the four-stage system most doctors use.
Whether you still smoke, vape, or quit years ago and worry it is too late, this guide walks you through what each stage means and what you can do now.
How many stages of COPD are there?
As of November 2026, Lung.org’s stage page says there are four stages of COPD, and that your healthcare provider uses the stage to judge severity and guide treatment. The Global Initiative for Chronic Obstructive Lung Disease (GOLD) system is the one most doctors use to sort COPD into stages, according to Living with COPD’s stage guide, and GOLD’s 2025 report is the reference for that system. A 2020 position paper from Czech pneumology experts, indexed on PubMed, uses GOLD stages 1 to 4.
How do you tell what stage of COPD you have?
Your clinician stages COPD mainly from breathing tests and how you are doing day to day. Lung.org says your provider looks at spirometry or other pulmonary function test results, your risk or history of flare-ups, your symptoms, and other health conditions. Living with COPD adds the severity of your symptoms and how frequently exacerbations, or flare-ups, occur.
To find out whether you have COPD at all, the Office on Women’s Health says your doctor will ask about your symptoms, health history and exposures, examine you, and do a spirometry test. In that test you take a deep breath and blow as hard as you can into a machine that measures how much air you breathe out and how fast. Our spirometry test guide explains what the numbers measure and where the test has limits.
The 2020 Czech position paper lists a post-bronchodilator result of FEV1/VCmax below 70% as the spirometry requirement for diagnosis. In plain terms, that is the share of your total breath you can push out in the first second, measured after an inhaler.
What do the four COPD stages feel like?
The table below uses the descriptions Lung.org gives for each stage.
| Stage | What you may notice |
|---|---|
| Stage 1: Mild | Little to no symptoms. On an incline or during exercise you may feel short of breath. |
| Stage 2: Moderate | More symptoms on a regular basis. You may feel out of breath walking on flat surfaces or over a longer distance. |
| Stage 3: Severe | Daily symptoms that are more troublesome, and everyday activities become harder to complete. |
| Stage 4: Very severe | Everyday activities are difficult, energy is lower, and you may have low oxygen levels. |
How bad is stage 2 COPD?
Stage 2 is the moderate stage. Living with COPD describes it as the point where the symptoms from stage 1, such as coughing, mucus and breathlessness during exercise, become more noticeable as airflow gets more restricted. Talk with your clinician about treatment if you have not already.
What is stage 3 COPD?
Stage 3 is the severe stage. Living with COPD says earlier symptoms have worsened, with more shortness of breath and coughing during everyday activities. It also lists reduced exercise ability, chronic tiredness, and in some people, more difficulty breathing even at rest.
What is stage 4 COPD, and how long do people live with it?
Stage 4 is the very severe stage, which Living with COPD calls the most advanced. Lung function is low, breathing difficulty is very noticeable, and daily activities can be severely limited. You may need oxygen therapy to help with breathing. Living with COPD also says some people in this stage go to hospital because of breathing complications, lung infections or respiratory failure, and that sudden exacerbations pose a life-threatening risk.
The 2020 Czech position paper recommends assessing prognosis for each patient using the BODE or CADOT index. Ask your clinician which one they use, what your score is, and what it means for your next few years.
How long does the end stage of COPD last?
Lung.org says everyone’s COPD journey is different, and that COPD is a progressive lung disease that gets worse over time. It also says there are many things you can do to slow the progression, at any stage. Womenshealth.gov describes COPD as a lifelong disease that usually gets worse over time, and it also says treatment can relieve some symptoms for some time.
What are the warning signs that COPD is getting worse?
If your breathing suddenly gets worse, or you have trouble breathing or pain or discomfort in your chest, contact your clinician right away instead of waiting for your next routine visit. Womenshealth.gov advises talking to your doctor about a cough that will not go away, trouble breathing, or chest pain or discomfort.
The phrase “lungs shutting down” is not a medical term. The closest concern in these sources is respiratory failure, which Living with COPD lists as a reason some people with stage 4 end up in hospital. Flare-ups are the sudden worsening of symptoms. As of November 2026, Lung.org says frequent flare-ups can speed up disease progression, and advises that as soon as you notice your COPD symptoms are worsening, you call your healthcare provider to get back on track. Our page on copd early signs covers the symptoms that usually prompt screening.
What are the COPD stages oxygen levels?
Oxygen is measured two ways, according to womenshealth.gov. An arterial blood gas test measures the oxygen and carbon dioxide levels in your blood and can help show whether you need oxygen therapy. Pulse oximetry uses a clip on your finger or earlobe to estimate your blood oxygen. Lung.org notes that people in stage 4 may have low oxygen levels, and womenshealth.gov lists oxygen therapy through a tube or mask for severe COPD. Whether you need oxygen is a decision your clinician makes from these tests, not from a single reading.
What treatment is used at each COPD stage?
Living with COPD describes treatment that changes with your symptoms and flare-ups, and it notes that treatment also depends on any other health conditions you have. The table below summarizes what it describes.
| Situation | Treatment Living with COPD describes |
|---|---|
| Mild symptoms | A bronchodilator, most often an inhaler, along with quitting smoking and staying active |
| More noticeable symptoms | Two types of long-acting bronchodilators, plus pulmonary rehabilitation (exercise programs for lung health) |
| Frequent flare-ups or hospital visits | Inhaled corticosteroids added to the long-acting bronchodilators, to reduce inflammation |
| Very severe (stage 4) | Oxygen therapy may be needed to help with breathing |
Womenshealth.gov lists the wider options: medicines to open airways and lessen inflammation, antibiotics when lung infections occur, pulmonary rehabilitation, oxygen therapy for severe COPD, and surgery in some cases. It says a lung transplant is used only as a last resort and may not help with COPD. It also states plainly that “treatments will not fix any lung damage you already have.” Any product or treatment that claims to fix lung damage is working against that statement.
What can I do at any COPD stage?
Quit smoking, and get help if you vape. Womenshealth.gov says quitting smoking is the only proven way to slow down COPD, and that quitting can improve symptoms, though it cannot make COPD go away. Womenshealth.gov says women benefit even more from quitting than men do, showing twice as much improvement in breathing one year after quitting. The CDC’s smoking cessation fast facts say tobacco dependence often takes multiple tries, and that using counseling and medication together gives the best chance of quitting successfully. Free help is available by calling the quitline at 1-800-QUIT-NOW (1-800-784-8669), per womenshealth.gov.
On vaping, MyHealthfinder notes that e-cigarette aerosol is not harmless, and that the FDA has not approved e-cigarettes as a quit-smoking aid. If you vape and want to quit, Smokefree.gov’s tools and tips cover quit plans, apps and text programs.
Protect your lungs day to day. Womenshealth.gov advises limiting exposure to smoke, dust, fumes and chemicals at home and work, and limiting outdoor activities during air pollution alerts. Ask about the flu and pneumonia shots, since womenshealth.gov notes that these illnesses can cause serious problems for people with COPD.
Are there new COPD treatments coming?
The 2020 Czech position paper says new classes of treatment are expected to enter clinical practice in a few years. It names inhaled PDE3/4 inhibitors, single molecule dual bronchodilators, anti-inflammatory drugs, gene editing molecules and new bronchoscopic procedures. That paper is from 2020, so it cannot tell you which of these is available to you in 2026. For any new option, ask your clinician whether it is approved, whether it fits your stage, and whether a clinical trial is an option.
Questions to bring to your next visit
- What stage am I in, and which tests were used to decide?
- What is my prognosis, and how was it worked out, using BODE, CADOT or another measure?
- Which treatments fit my stage, and are any newer options relevant to me?
- Do I need an arterial blood gas test or pulse oximetry to check my oxygen?
- Am I due for flu and pneumonia shots?
- Where can I get help to quit, and is pulmonary rehabilitation available near me?
For more on the signs that lead to testing, read our guide to smoker’s cough or copd. To understand what damage happens inside the airways at each stage, see copd airway remodeling and inflammation.
By SmokersLung.com Respiratory Health Education Team
This article is for general information purposes only and does not constitute medical advice. Consult your doctor or qualified healthcare provider before making changes to your health routine.