Lung Cancer:Symptoms,Causes,Diagnosis & Ttreatment

Lung Cancer: Lung cancer( lung carcinoma) is a malignant lung tumor distinguished by uncontrolled cell increase in tissues of the lung. This increase can spread beyond the lung by the means of metastasis into nearby tissue or different parts of the body. Largest cancers that start in the lung, known as primary lung cancers, are carcinomas. The Lung cancer are two main types-Lung cancerSmall-cell lung carcinoma (SCLC)
Non-small-cell lung carcinoma (NSCLC)
The usual common symptoms are coughing (including coughing up blood), weight loss,  chest pains, and shortness of breath.

Cause of Lung Cancer

Most incidents of lung cancer are induced by smoking, although people who have nevermore smoked can further develop the condition.


Smoking cigarettes are liable for more than 85% of all incidents.

Tobacco smoke carries more than 60 different toxic substances, which can influence the development of cancer. If you smoke higher than 20 cigarettes a day, you are 20 times more liable to get lung cancer than a non-smoker.

Other types of tobacco outputs can also enhance your risk of promoting lung cancer, these products include:

  • Pipe tobacco
  • Cigars
  • Chewing tobacco
  • Snuff (a powdered form of tobacco)


Smoking cannabis has also been connected to an enhanced risk of lung cancer.

Passive smoking

If you don't smoke, repeated exposure to other people’s tobacco smoke can enhance your risk of receiving lung cancer.

For instance, analysis has found that non-smoking women who share their house with a smoking partner are 25% more liable to receive lung cancer.


Radon is a naturally happening radioactive gas that occurs from tiny quantities of uranium present in all rocks and soils. It can sometimes be detected in buildings.

If radon is breathed in, it can hurt your lungs, especially if you're a smoker. Radon is estimated to be engaged in about 3% of all lung cancer.

Occupational exposure and pollution

Exposure to several chemicals and substances applied in several occupations and industries has been connected to a slightly higher risk of developing lung cancer, these chemicals include-

  • Asbestos
  • Arsenic
  • Beryllium
  • Coal and coke fumes
  • Cadmium
  • Nickel
  • Silica

Research also recommends that being exposed to large quantities of diesel fumes for many years may increase your risk of developing lung cancer by up to 50%.

Symptoms of Lung Cancer

Symptoms of lung cancer are differed depending upon where and how extensive the tumor is. Warning signs of lung cancer are not eternally present or easy to recognize. Lung cancer may not induce pain or other symptoms in some cases.









Symptoms of lung cancer increase as the situation progresses and there are habitually no signs or symptoms in the early steps.

The chief symptoms include-

  • A long-standing cough that gets serious
  • A cough that doesn’t go off after two or three weeks
  • Coughing up blood
  • Persistent chest infections
  • An ache during breathing or coughing
  • Persistent tiredness
  • Tenacious breathlessness
  • Loss of appetite or unexplained weight loss

Less common symptoms involve-

  • Finger clubbing, alterations in the appearance of your fingers, such as shifting more curved or their ends becoming larger.
  • Trouble in swallowing or pain during swallowing
  • A high warmth (fever) of 38C (100.4F) or higher
  • Swelling of your neck or face
  • Wheezing
  • A hoarse voice
  • Persistent shoulder or chest pain


Diagnosis of Lung Cancer

Your physicians will question about your general health and what symptoms you've been feeling. Your physicians may check you and suggest you breathe into a device named a spirometer, which estimates how much air you breathe in and out.

You may be required to have a blood test to rule out some of the probable causes of your symptoms, such as a chest contamination.

Chest X-ray

A chest X-ray is normally the first test utilized to diagnose lung cancer. Most lung tumors determine up on X-rays as a white-grey mass.

Though, chest X-rays can't give a clear-cut diagnosis because they often can't differentiate between cancer and other conditions, such as a lung abscess.

CT scan

A computerized tomography (CT) scan is habitually taken out following a chest X-ray. Before oughta CT scan, you'll be given an injection of a contrast medium. This is a liquid comprising a dye that makes the lungs show up more visible on the scan. The scan is painless and takes 10-30 minutes to complete.

PET-CT scan

A PET-CT scan may be conducted out if the results of the CT scan show you hold cancer at an early stage.

The PET-CT scan can determine where there are active cancer cells. This can assist with diagnosis and treatment.

Bronchoscopy and biopsy

If the CT scan shows there might be the cancer in central part of your chest, you'll have a bronchoscopy. A bronchoscopy is a method that enables a doctor to remove a small unit of cells from inside your lungs.

Through a bronchoscopy, a thin tube termed a bronchoscope is utilized to examine your lungs and take a sample of cells.The bronchoscope is given through your mouth or nose, down your throat and into the airways of your lungs.

Other types of biopsy

You may be suggested another type of biopsy. This may be a type of surgical biopsies such as a mediastinoscopy or, a thoracoscopy or a biopsy carried out utilizing a needle inserted through your skin.

Percutaneous needle biopsy

A percutaneous needle biopsy comprises removing a sample from a suspected tumor to experiment it at a laboratory for cancerous cells.


A thoracoscopy is a method that enables the doctor to examine a demanding area of your chest and take tissue and fluid specimens.


A mediastinoscopy enables the physician to examine the area within your lungs at the center of your chest (mediastinum).

lung cancer stages





















Once these tests have been performed, it should be likely to work out what stage your cancer is, what this means for your therapy and whether it's probably to completely cure cancer.

Non-small-cell lung cancer

Non-small-cell lung cancer (the most common) normally spreads more slowly than small-cell lung cancer and responds differently to treatment.

The stages of non-small-cell lung cancer are:

Stage 1

The cancer is held inside the lung and hasn't reached to nearby lymph nodes. Stage 1 can also be distributed into two sub-stages:

  • Stage 1A – tumour is less than 1.2 inches or 3cm in size
  • Stage 1B – tumour is 1.2-2 inches or 3-5cm

Stage 2

Stage 2 is subdivided into two stages: 2A and 2B.

In stage 2A lung cancer:

  • Tumour is 5-7cm
  • Tumour is less than 5cm and cancerous cells have reached to nearby lymph nodes

In stage 2B lung cancer, either:

  • Tumour is larger than 7cm
  • Tumour is 5-7cm and cancerous cells have reached to nearby lymph nodes
  • Cancer hasn't reached to lymph nodes, but has scattered to surrounding muscles or tissue
  • The cancer has reached to one of the main airways (bronchus)
  • The cancer has made the lung to collapse
  • There are multiple small tumours in the lung

Stage 3

Stage 3 is subdivided into two stages: 3A and 3B.

In grade 3A lung cancer, the cancer has either reached to the lymph nodes in the middle of the chest or within the surrounding tissue. This can be:

  • The cover of the lung
  • The chest wall
  • The middle of the chest
  • Other lymph nodes near the involved lung

In grade 3B lung cancer, the cancer has reached to either of the following:

  • Lymph nodes on either side of the chest, over the collarbones
  • Another important part of the body, such as the esophagus, trachea, heart or into a main blood vessel

Stage 4

In stage 4 lung cancer, cancer has either reached to both lungs or to another part of the body (bones, liver or brain).

Small-cell lung cancer

Small-cell lung cancer is tiny common than non-small-cell lung cancer. The cancerous cells liable for the condition are smaller in size while observed under a microscope than the cells that cause non-small-cell lung cancer.

Small-cell lung cancer only has two possible stages:

  • Limited disease – cancer has not reached beyond the lung
  • Extensive disease – cancer has reached beyond the lung

Treatment of Lung Cancer

Treatment for lung cancer fundamentally requires surgical removal of the cancer, chemotherapy, or radiation therapy, or combinations of these treatments. The determination about which treatments will be suitable for an individual requirement takes into account the location and extent of the tumor, also prior overall health status of the patient.

An example of adjuvant therapy is chemotherapy or radiotherapy administered after surgical removal of tumor cells.

lung cancer treatment


There are three types of  surgery for lung cancer:

  • Lobectomy – where parts of the lung (called lobes) are eliminated. Your physicians will recommend this operation if the cancer is only in one section of one lung.
  • Pneumonectomy – where the whole lung is removed. This is practiced when the cancer is found in the middle of the lung or has scattered throughout the lung.
  • Segmentectomy – where a small portion of the lung is removed. This method is only proper for a small number of patients, as it is only used if your physicians think your cancer is small and limited to one area of the lung. This is normally really early-stage non-small-cell lung cancer.