# Symptoms and stages in non-small cell lung cancer
The course of non-small cell lung cancer depends heavily on the stage at which it is detected and how aggressively the tumor grows. The disease is classified into stages (I to IV), with each stage indicating how far the cancer has spread. Below is a description of how symptoms and disease progression typically manifest per stage.
Stage I: early, locally limited
In stage I, the tumor is small and limited to the lung, without spread to lymph nodes or other organs.
**Symptoms:**
In this phase, many people have no symptoms at all. Cancer is often discovered by chance during an examination for another purpose, for example a CT scan prompted by another problem. When symptoms do occur, these may include:
- Cough lasting months (especially if it is different from your normal cough)
- Minor blood traces in sputum (mucus)
- Mild chest pain, especially when breathing or coughing
- Mild shortness of breath
**Meaning for daily life:**
Because many people in this stage have no or very mild symptoms, they usually notice little of the disease in their daily functioning. After diagnosis, however, anxiety and uncertainty about treatment and the future can be significant. Most people can continue their normal daily activities, although fatigue may occur due to mental strain.
**Survival rates stage I:**
For stage IA non-small cell lung cancer, five-year survival (after diagnosis) is approximately 90% or higher; for stage IB this drops to approximately 80-85%. These figures are based on large patient cohorts and apply at population level — individual outcomes vary greatly and depend on factors such as age, lung function, presence of gene mutations, and how the tumor behaves biologically (source: WHO, international registries 2020-2024).
Stage II: larger tumor or lymph nodes involved
In stage II, the tumor has grown larger or nearby lymph nodes are affected, but cancer has not yet spread to other organs.
**Symptoms:**
- Persistent cough, sometimes with mucus or slight blood streaks
- Shortness of breath, especially during exertion
- Fatigue and lack of energy
- Chest or shoulder pain, especially when breathing deeply or with movement
- Possible slight hoarseness (if the tumor presses against a nerve)
- Occasionally painful sensation when swallowing (if the tumor affects lymph nodes in the chest)
**Meaning for daily life:**
Symptoms become more noticeable. Many people experience that they tire more quickly and can walk less distance or tolerate less exertion. The cough can be bothersome, especially in silence or at night. The disease thus begins to have more visible impact on work, household chores and leisure activities. Many feel anxious about the diagnosis.
**Survival rates stage II:**
For stage IIA, five-year survival is approximately 60-70%; for stage IIB approximately 50-60%. Here too, these figures reflect the average across large groups of patients and do not predict what happens individually. Much depends on the treatment chosen and how well it is responded to (source: international lung cancer registries, 2020-2024).
Stage IIIA and IIIB: locally advanced
In stage III, the tumor is larger and/or multiple lymph nodes are involved, or cancer is already in structures in or around the chest (such as the membrane around the lungs or the chest wall). Stage IIIA and IIIB indicate a growing difference in extent.
**Symptoms:**
- Persistent, severe cough
- Hemoptysis (blood in sputum)
- Significant shortness of breath, possibly also at rest
- Pronounced fatigue and weight loss
- Chest pain, especially with deep breathing or coughing
- Hoarseness (due to pressure on nerve to vocal cords)
- Pain in the back or shoulder (if the tumor spreads outward)
- Sometimes swollen face or neck (due to pressure on blood vessels)
- Difficulty swallowing in some cases
**Meaning for daily life:**
The symptoms now have a clear impact. Many people can no longer work and need help with household tasks. The cough and shortness of breath can be disturbing day and night. Movement becomes more complicated, and many activities require breaks. The weight loss and fatigue create a feeling of weakness. Emotionally, this is a critical phase in which the seriousness of the disease becomes increasingly clear.
**Survival rates stage III:**
For stage IIIA, five-year survival is approximately 35-40%; for stage IIIB approximately 20-30%. These patients usually receive more intensive treatment (often a combination of chemotherapy, radiation and sometimes surgery), and there is a chance that treatment will slow or delay the disease process, but this is not guaranteed. Variability between patients is large (source: international registries, 2020-2024).
Stage IV: metastasized (spread)
In stage IV, the cancer has spread to other organs — usually to the other lung, brain, bones, liver or adrenal glands.
**Symptoms:**
The symptoms depend on where the metastases are located, but can include:
- All cough and breathing problems from earlier stages, now worse
- Coughing up blood, sometimes in larger amounts
- Severe fatigue and weight loss
- Pain in various places (back, legs, skull) from the metastases
- Neurological symptoms if the cancer is in the brain: headache, dizziness, balance problems, blurred vision, concentration problems
- Fractures (spontaneous breaking of bones) if there are bone metastases
- Yellowed eyes and skin, abdominal pain if the liver is affected
- Seizures or loss of consciousness (with brain metastases)
- Jaundice, nausea and reduced appetite
**Meaning for daily life:**
The disease now dominates daily life. Most people can no longer function independently and need professional care and support at home or in an institution. Pain management becomes important. Many patients can no longer work and struggle with even basic activities. Emotionally and psychologically, this is a period of major change in life expectancy and priorities.
**Survival rates stage IV:**
The median survival (the point at which half of the patients are still alive) is approximately 6-8 months without treatment. With modern immunotherapy (checkpoint inhibitors) or targeted therapies, depending on genetic characteristics of the tumor, this can be considerably longer — on average 12-18 months or more in some subgroups. However, these figures are averages; some patients live for years, others shorter. Much depends on how well the tumor responds to treatment and on physical reserves (source: clinical trials and registries, 2022-2024).
Recent research focuses on ways to better tailor the immune response and on combinations of treatments that can slow disease progression.
Contact with your healthcare provider
Contact your doctor or hospital staff when:
- Your cough gets worse or lasts longer than expected
- You get blood in your sputum or cough up blood
- Your shortness of breath increases, even at rest
- You get severe chest pain, especially in new locations
- You experience severe weight loss or suddenly lose appetite
- You develop new neurological symptoms: headache, dizziness, confusion, blurred vision
- You develop high fever or feel very unwell
- You get pain in new locations that doesn't go away
- You don't tolerate your medication well or experience unexpected side effects
These are signals that your doctor needs to assess how your disease is progressing and whether your treatment needs to be adjusted.
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_This information never replaces a doctor's judgment. Always discuss your situation with your own healthcare provider._