Pneumonia is an infection that inflames the air sacs in one or both lungs. The air sacs may fill with fluid or pus (purulent material), causing cough with phlegm or pus, fever, chills, and difficulty breathing. A variety of organisms, including bacteria, viruses and fungi, can cause pneumonia.
Pneumonia can range in seriousness from mild to life-threatening It is most serious for infants and young children, people older than age 65, and people with health problems or weakened immune systems.
Causes -Many germs can cause pneumonia. The most common are bacteria and viruses in the air we breathe. Your body usually prevents these germs from infecting your lungs. But sometimes these germs can overpower your immune system, even if your health is generally good.
Pneumonia is classified according to the types of germs that cause it and where you got the infection.
Community-acquired pneumonia
Community-acquired pneumonia is the most common type of pneumonia. It occurs outside of hospitals or other health care facilities. It may be caused by:
Bacteria. The most common cause of bacterial pneumonia in the U.S. is Streptococcus pneumoniae. This type of pneumonia can occur on its own or after you've had a cold or the flu. It may affect one part (lobe) of the lung, a condition called lobar pneumonia.
Bacteria-like organisms. Mycoplasma pneumoniae also can cause pneumonia. It typically produces milder symptoms than do other types of pneumonia. Walking pneumonia, a term used to describe pneumonia that isn't severe enough to require bed rest, may be caused by M. pneumoniae.
Viruses. Some of the viruses that cause colds and the flu can cause pneumonia. Viruses are the most common cause of pneumonia in children younger than 5 years. Viral pneumonia is usually mild. But in some cases it can become very serious.
Fungi. This type of pneumonia is most common in people with chronic healthproblems or weakened immune systems, and in people who have inhaled large doses of the organisms. The fungi that cause it can be found in soil or bird droppings
Hospital-acquired pneumonia
Some people catch pneumonia during a hospital stay for another illness. This type of pneumonia can be serious because the bacteria causing it may be more resistant to antibiotics. People who are on breathing machines (ventilators), often used in intensive care units, are at higher risk of this type of pneumonia.
Health care-acquired pneumonia
Health care-acquired pneumonia is a bacterial infection that occurs in people who are living in long-term care facilities or have been treated in outpatient clinics, including kidney dialysis centers. Like hospital-acquired pneumonia, health care-acquired pneumonia can be caused by bacteria that are more resistant to antibiotics.
Aspiration pneumonia
Aspiration pneumonia occurs when you inhale food, drink, vomit or saliva into your lungs. Aspiration is more likely if something disturbs your normal gag reflex, such as a brain injury or swallowing problem, or excessive use of alcohol or drugs.
Symptoms--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. Mild signs and symptoms often are similar to those of a cold or flu, but they last longer.
Signs and symptoms of pneumonia may include:-Fever, sweating and shaking chills
Cough, which may produce phlegm, Chest pain when you breathe or cough, Shortness of breath, Fatigue, Nausea, vomiting or diarrhea

ACONITUM NAPELLUS 30- A remedy for the first stage of pneumonia. High fever preceded by chill. The pulse is hard and the skin is dry. Dry painful cough. Due to dry cold winds. When thick expectoration starts Aconitum ceases to be the remedy
ANTIMONIUM TART. 30- Great rattling of mucus but very little is expectorated and that too with some efforts. Threatened paralysis of the lungs
ARSENICUM ALB 30- Dyspnea. Thirst, drinks often but little. Fever with restlessness
BRYONIA ALB 30- If the above remedies fail to cure, use this remedy is indicated. Cough is loose and there are sharp sticking pains in the chest. Breathlessness and the patient does not want to move
CHELIDONIUM 30, LYCOPODIUM 200- Fan like motion of the alae nasi. Pain under the corner of right shoulder blade is a sure indication for the use of Chelidonium
FERRUM PHOS 6X- In the beginning of the disease or in the later stages, when there is bleeding from the lungs. Repeat it every every  2 hours . A suitable remedy for fever
IPECACUANHA 30- Nausea . Wheezing cough. Chest feels full of phlegm but does not yield to cough. Pneumonia of children
IODUM 3X- It can be indicated in any form of pneumonia. There is cough and difficulty in breathing. The sputum is bloody. Repeat it every hour when indicated
KALI CARB 200- Copious expectoration. Offensive, tenacious, pus like blood streaked  sputum. Coldness of chest and wandering  stitching pains. Worse 3 to 4 am
KALI MUR 30- This remedy is altered with Ferrum phos for good results in this disease . The mucus is thick and white
PHOSPHORUS 200- Give one dose if Ant tart and Bryonia fail. It follows Bryonia very well. This remedy is more often indicated and gives curative results
TUBERCULINUM 1000- Broncho pneumonia of children. Hard hacking cough. Profuse sweat and loss of weight. Rales all over the chest
VERATRUM VIRIDE 30- Extreme congestion of the chest, breathing opprened. Dyspnea, nausea and vomiting

SULPHUR 200- Used when exudation sets in Prevents formation of undissolved patches and also cure them 

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