Extreme short of breath. My pulmonary doctor first diagnosed as asthma, then after more tests, says I have copd. How do I know it's not lung cancer?

Be at peace. Say the same thing to your pulmonologist and he might order t scan of lungs 2nd opinion is worth too. Are you a smoker ? Loosing wt ?
Need more data. Using a combination of a thorough history of symptoms looking for risk factors and examination and imaging.
Imagine study. Usually an imaging study - CXR, CT scan of chest - will be able to rule in or rule out a mass lesion that could be cancer.

Related Questions

My doctor listens to my lungs and they sound perfect she says, is there any way I could have lung cancer because I am short of breath and have chest pain occasionally.

No. You do not have lung cancer.
For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form.
Practice safe sex, if you have sex. Read more...

I have been smoking cigarettes since I was 13 and I'm 25 now. I also have asthma. Right now I'm sick with a cold and am short of breath. Lung cancer?

Probably not. Although you smoke, it is probably an exacerbation of your asthma due to an upper respiratory infection. Viruses are more likely to aggravate asthma than bacterial infedtions. However, continuing to smoke significantly increases your risk of lung cancer and copd. Read more...

Shortness of breath with mucus for a year. Doc has said Gerd. Doesn't think asthma. Smoked 10 yrs.25. Lung test normal. Copd? Pneumonia? Just smoking?

Consult an allergist. There are many causes for breathing difficulties and I think you are too young to have chronic bronchitis from smoking. If you have problem getting enough air when breathing in, conditions such as vocal cord dysfunction needs be ruled out as well. You should definitely stop smoking however regardless what is causing the breathing issue. Read more...
Quit smoking. The most obvious answer of course is that you have to stop smoking. There is no benefit from smoking, and as long as you continue to do so, you will be short of breath and have increased mucous and cough. You know this. Smoking makes asthma, GERD and COPD worse if you have them. Smoking causes other serious chronic health problems, such as cancers, stroke, heart disease. Have you tried Chantix? Read more...

Doctors said that my shortness of breath and back pain is anxiety after blood tests and chest xray in Dec. But I think lung cancer, chances?

Small. Chest xray was several months ago but is reassuring. You are young. What risk factors exist? Is chest pain rib or chest wall pain? Another check up can reassure you. Shortness of breath can be further evaluated with spirometry. Can you walk and exercise? . Read more...
Further evaluation. Lung cancer doesn't appear likely and stress and tension certainly can cause these symptoms. However, if symptoms persist, I recommend further testing such as EKG, echocardiogram, chest cat scan, pulmonary function testing, spine xrays for reassurance. However, your physician is best qualified to advise you. Read more...
Extremely. low chance of cancer based on your age, symptoms, and negative work up. Read more...

Never have enough air in my lungs to take a real deep breath. Could this be COPD or lung cancer?

Deep breath. Not likely. However, if this is a persistent problem, you should have a chest x-ray to start and see your physician. Read more...