Lung cancer in its early stages often progresses silently and may not yet cause clear symptoms. However, certain changes such as a persistent cough, coughing up blood, chest pain or breathlessness are still signs that should not be taken lightly.
According to the CDC, many people with lung cancer only develop symptoms once the disease has advanced. Recognising unusual signs and seeing a doctor at the right time can therefore help identify the cause sooner.
1. A persistent cough or a cough that changes unusually
😷 A cough is a very common symptom and in most cases has nothing to do with cancer.
However, you should take notice if:
- The cough lasts a long time without improving
- The cough is getting worse
- A dry cough turns into a cough with phlegm
- Someone with a long-standing chronic cough notices that the nature of the cough has changed
Both the CDC and the American Cancer Society list a cough that does not go away or that gets worse among the common symptoms of lung cancer.
There is no cut-off that says “more than 3 weeks = lung cancer”. If a cough lasts several weeks or is quite different from usual, you should see a doctor to establish the cause.
2. Coughing up blood or blood-stained phlegm
🩸 This is a sign that needs particular attention.
Blood may appear as:
- A few streaks of blood in the phlegm
- Phlegm that is red or rust-brown
- Coughing up a larger amount of blood
Coughing up blood can be due to many conditions such as respiratory tract infection, pulmonary tuberculosis or bronchiectasis, but it is also a symptom recorded in lung cancer.
👉 Even if the amount of blood is small, you should still see a doctor to find the cause.
3. Persistent chest pain or tightness
💢 Lung cancer can cause pain or discomfort in the chest.
The pain may:
- Be dull or persistent
- Increase when you breathe in deeply
- Hurt more when you cough or laugh
- Spread to the shoulder or back in some cases
The American Cancer Society records chest pain, particularly pain that increases when you breathe in deeply, cough or laugh, as one of the symptoms that can occur in lung cancer.
4. Breathlessness or new wheezing
🫁 If you used to go about your daily life normally but recently often have:
- Shortness of breath
- Breathlessness on light exertion
- A feeling of not getting enough air
- New wheezing
then you should be checked.
Breathlessness and wheezing can appear when the airways are affected, but they are also common in asthma, COPD, pneumonia and many other heart and lung conditions.
5. Persistent hoarseness with no clear cause
🗣️ Hoarseness often appears with a cold, a sore throat or overuse of the voice.
However, hoarseness that does not improve or lasts unusually long is also among the symptoms that can occur in lung cancer.
In some cases, a tumour or lymph nodes in the chest can affect the nerve that supplies the larynx and change the voice.
If hoarseness persists with no clear cause, do not simply treat yourself with sore throat medicines.
6. Unexplained weight loss
⚖️ If your weight is falling even though you are:
- Not dieting
- Not exercising more
- Not deliberately trying to lose weight
then this is a sign that needs assessment.
Unintentional weight loss and a reduced appetite are both among the symptoms that can occur in people with lung cancer.
However, weight loss can also occur in many endocrine, digestive and infectious conditions and in other cancers.
7. Persistent fatigue, weakness or loss of appetite
😴 Anyone can feel tired from lack of sleep or overwork.
What is worth noting is:
- Fatigue that lasts a long time
- An unusual feeling of weakness
- Little improvement despite rest
- Eating poorly or having no appetite
- Accompanied by cough, breathlessness or weight loss
The CDC lists persistent fatigue and unexplained weight loss among the symptoms of lung cancer.
Does having the 7 signs above definitely mean lung cancer?
❌ No.
This is very important.
Cough, chest pain, breathlessness and hoarseness can all appear in conditions that are far more common, such as:
- Colds and flu
- Bronchitis
- Asthma
- Pneumonia
- Pulmonary tuberculosis
- Gastro-oesophageal reflux
- Cardiovascular disease
For that reason, symptoms alone cannot be used to diagnose lung cancer.
If you have suspicious symptoms, your doctor can review your history, carry out a clinical examination and order imaging or any tests needed. A final, confirmed diagnosis of cancer may require a tissue sample for testing.
When should you see a doctor?
You should consider seeing a respiratory specialist if you have:
🚩 A persistent cough or one that is getting worse
🚩 Coughing up blood
🚩 Persistent chest pain
🚩 New breathlessness or wheezing
🚩 Persistent hoarseness with no clear cause
🚩 Unusual weight loss
🚩 Persistent fatigue with respiratory symptoms
🚩 Repeated episodes of bronchitis or pneumonia
The American Cancer Society advises against ignoring these symptoms, because looking for the cause early can help detect the disease at an earlier stage if cancer does turn out to be the cause.
Should you be screened for lung cancer before any symptoms appear?
Screening is different from being seen when you have symptoms.
Screening is carried out in people who have no symptoms yet but are in a high-risk group.
The method used to screen for lung cancer in eligible groups is:
👉 Low-dose chest CT – Low-Dose CT (LDCT).
The CDC states that lung cancer screening is only recommended for people in high-risk groups, based mainly on age and smoking history.
If you have already developed coughing up blood, chest pain or persistent breathlessness, this is no longer simply a matter of “going for screening”: you should see a doctor to have the cause diagnosed.
Do not wait for all 7 signs before seeing a doctor
Early-stage lung cancer may not show clear signs. Nor does someone need to have all 7 signs before taking notice.
In particular, if you have:
Coughing up blood – unusual breathlessness – persistent chest pain – a cough that keeps getting worse
take the initiative and see a doctor to establish the cause.
💚 Noticing one unusual sign does not mean you have cancer. But getting checked early lets you know exactly what is happening in your body.
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References
📚 Centers for Disease Control and Prevention (CDC) – Symptoms of Lung Cancer, updated 12/05/2026
📚 National Cancer Institute (NCI) – Non-Small Cell Lung Cancer Treatment
📚 American Cancer Society (ACS) – Signs and Symptoms of Lung Cancer
📚 American Cancer Society (ACS) – Tests for Lung Cancer
📚 FV Hospital – Lung Cancer Screening Programme
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