Some of the viruses that cause colds and the flu can cause pneumonia. The fungi that cause it can be found in soil or bird droppings and vary depending upon geographic location. This type of pneumonia is most common in people with chronic health problems or weakened immune systems, and in people who have inhaled large doses of the organisms. Walking pneumonia is an informal name given to this type of pneumonia, which typically isn't severe enough to require bed rest. It typically produces milder symptoms than do other types of pneumonia. Mycoplasma pneumoniae also can cause pneumonia. It may affect one part (lobe) of the lung, a condition called lobar pneumonia. This type of pneumonia can occur on its own or after you've had a cold or the flu. The most common cause of bacterial pneumonia in the U.S. It occurs outside of hospitals or other health care facilities. Community-acquired pneumoniaĬommunity-acquired pneumonia is the most common type of pneumonia. Pneumonia is classified according to the types of germs that cause it and where you got the infection. But sometimes these germs can overpower your immune system, even if your health is generally good. Your body usually prevents these germs from infecting your lungs. The most common are bacteria and viruses in the air we breathe. People receiving chemotherapy or taking medication that suppresses the immune systemįor some older adults and people with heart failure or chronic lung problems, pneumonia can quickly become a life-threatening condition.People with an underlying health condition or weakened immune system.Children younger than age 2 with signs and symptoms.It's especially important that people in these high-risk groups see a doctor: See your doctor if you have difficulty breathing, chest pain, persistent fever of 102 F (39 C) or higher, or persistent cough, especially if you're coughing up pus. Or they may vomit, have a fever and cough, appear restless or tired and without energy, or have difficulty breathing and eating. Newborns and infants may not show any sign of the infection. Lower than normal body temperature (in adults older than age 65 and people with weak immune systems).Confusion or changes in mental awareness (in adults age 65 and older).Signs and symptoms of pneumonia may include: Mild signs and symptoms often are similar to those of a cold or flu, but they last longer. The signs and symptoms of pneumonia vary from mild to severe, depending on factors such as the type of germ causing the infection, and your age and overall health.

Different lung sounds