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What is Pneumonia causes






Some cases of pneumonia are contracted by breathing in small droplets that contain the organisms that can cause pneumonia. These droplets get into the air when a person infected with these germs coughs or sneezes. In other cases, pneumonia is caused when bacteria or viruses that are normally present in the mouth, throat, or nose inadvertently enter the lung. During sleep, it is quite common for people to aspirate secretions from the mouth, throat, or nose. Normally, the body's reflex response (coughing back up the secretions) and their immune system will prevent the aspirated organisms from causing pneumonia. However, if a person is in a weakened condition from another illness, a severe pneumonia can develop. People with recent viral infections, lung disease, heart disease, and swallowing problems, as well as alcoholics, drug users, and those who have suffered a stroke or seizure are at higher risk for developing pneumonia than the general population. As we age, our swallowing mechanism can become impaired as does our immune system. These factors, along with some of the negative side effects of medications, increase the risk for pneumonia in the elderly.

Once organisms enter the lungs, they usually settle in the air sacs and passages of the lung where they rapidly grow in number. This area of the lung then becomes filled with fluid and pus (the body's inflammatory cells) as the body attempts to fight off the infection.



Exams and Tests


If you have pneumonia, you may be working hard to breathe, or breathing fast.
The health care provider will hear crackles when listening to your chest with a stethoscope. Other abnormal breathing sounds may also be heard through the stethoscope or via percussion (tapping on your chest wall).
The health care provider will likely order a chest x-ray if pneumonia is suspected.
Some patients may need other tests, including:
Arterial blood gases to see if enough oxygen is getting into your blood from the lungs
CBC to check white blood cell count
CT scan of the chest
Gram's stain and culture of your sputum to look for the bacteria or virus that is causing your symptoms
Pleural fluid culture if there is fluid in the space around the lungs







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