Lung Cancer Symptoms

Lung cancer symptoms are rarely felt until the disease has developed into an advanced stage. Even when symptoms are felt, people often tolerate them for some time before they seek medical assistance. For instance, it's easy to shrug off shortness of breath as being out of shape, or a chronic cough as a bad cold or allergies.
More obvious symptoms, such as coughing up blood or dyspnea (difficulty breathing), may occur before medical advice is asked for.Common lung cancer symptoms include:

Constant chest pain
Chronic cough that worsens over time
Coughing up blood (hemoptysis)
Dyspnea (difficulty breathing)
Fatigue
Lung infection (pneumonia, bronchitis)
Shortness of breath
Swollen lymph nodes
Loss of appetite and weight loss
Wheezing.
Wheezing, lung infection, chest pain, or other symptoms can indicate a number of medical conditions other than lung cancer and require professional diagnosis. Dyspnea and coughing up blood are alarming symptoms and require immediate medical attention.Swollen lymph nodes are a sign of infection. The lymphatic system is the primary response system to infections. Malignant cancer cells can also enter the lymphatic system, causing the nodes to swell, and travel to more distant parts of the body, causing the cancer to spread rapidly.There are other lung cancer symptoms in addition to the primary symptoms.

Some of the following may not appear to do much with the respiratory system but in combination with other symptoms can indicate lung cancer:
Bone pain and tenderness
Breast development in men
Weakness
Chills
Speech difficulties or changes (i.e., hoarsness)
Droopy eyelids
Swelling of the face and neck
Fever
Joint pain and swelling
Muscle weakness
Pale or bluish skin
Speech difficulties
The vague nature of many of these symptoms (wheezing, fatigue, shortness of breath, chest pain) shows the need for a reliable screening process for people in high-risk groups. Research has yet to develop a safe, effective screening tool, but clinical trials are making process.
From Asbestos Research Center