Pneumonia: Overview

Pneumonia is infection of the lungs.  The infection is in the lung tissue and the tiny air sacs in the lungs where the blood receives oxygen from air that is breathed in.  It is extremely common and can range from a mild illness to a fatal one, especially if the patient is already sick or in hospital.

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Pneumonia is not a single disease but refers to many different infections, each caused by a different micro-organism.

Causes and Development

Pneumonia can be caused by viruses, bacteria, fungi or bacteria-like organisms called mycoplasma.  Pneumonia can also be caused by the inhalation of substances into the lungs such as caustic chemicals, food or vomit.  This is known as aspiration pneumonia.

The most common cause of pneumonia in people aged five to 35 years is mycoplasma.  In older adults, the most common causes are bacteria (e.g. pneumococci), which are also a common cause in young infants.

Signs and Symptoms

The common symptoms of pneumonia are a cough with phlegm, fever, chills, chest pain and breathlessness.  However, they may vary greatly in severity and also depend on the type of organism causing the infection.

Bacterial and Mycoplasmal Pneumonia
Mycoplasma pneumonia usually starts with a dry cough and tiredness, followed occasionally by a rash and phlegm production.  Although the symptoms are usually mild, they can last for several weeks.

Pneumococcal pneumonia gives the common symptoms described above, such as the cough, fever and pain on the side of the affected lung.  Streaks of blood may be seen in the phlegm.

The bacterium Legionella pneumophila causes the pneumonia 'Legionnaire's disease'.  It spreads through water and can contaminate air-conditioning systems, which results in outbreaks of the disease.  The infection begins with aches and pains, fever and headache, followed by a cough that eventually produces phlegm.  Although the disease is usually mild, it can be severe, with extreme breathlessness, diarrhea and confusion.  About 20% of people who develop this disease die.

The bacterium Haemophilus influenzae does not cause flu (which is caused by the influenza virus); instead it is a major cause of pneumonia in children below the age of six years.  The pneumonia usually begins with sneezing and a runny nose, and then develops into the common symptoms described above.  In addition, some fluid commonly develops around the lung, called a 'pleural effusion'.  However, the 'type b' strain of the bacterium can cause severe illness such as meningitis and epiglottitis.

Viral Pneumonia
Many viruses can cause pneumonia, including influenza, herpes, measles and chickenpox.  The symptoms vary according to the type and severity of infection, but usually there is a cough, often with phlegm, fever and chills.

Fungal Pneumonia
Fungi can cause pneumonia, but they are relatively rare except in people who have suppressed immune systems (such as those with AIDS).

Diagnosis and Tests

The diagnosis is often obvious to a doctor from the symptoms.  A thorough examination of the chest, which involves tapping the chest and listening with a stethoscope, helps the doctor to locate where the infection is.  A chest X-ray may be carried out to confirm the diagnosis, but it may not show anything at all (relatively common in mycoplasmal pneumonia).  The doctor may also perform blood tests to confirm an infection is present.

The best test is to take some phlegm, examine it under the microscope and try to cultivate the organism that is causing the infection.  This helps establish which antibiotic the bacterium is susceptible to.  This is important (especially for pneumonias acquired in a hospital) because many bacteria are becoming resistant to antibiotics.

Treatment and Prevention

It is important, obviously, to avoid any of the risk factors such as smoking and excessive alcohol.  People who have had major surgery are shown how to do deep-breathing exercises and may be given physiotherapy to help clear mucous.

Most viral pneumonias are not treated with drugs that kill the virus: your body's immune system will usually do the job.  However, in some cases of chickenpox and herpes an antiviral drug may be used early in the course of the disease.


The outcome of pneumonia depends on the type of infection and its severity as well as on the age and general health of the patient.  Generally, however, the use of antibiotics has improved the outcome greatly.

Signs, symptoms & indicators of Pneumonia:

Symptoms - Abdomen

Symptoms - Metabolic

Symptoms - Nails

Blue/bluish fingernails

Nails with a bluish tint can mean the body isn't getting enough oxygen.  This could indicate an infection in the lungs, such as pneumonia.

Symptoms - Respiratory

Chest pain when breathing

The pain of lobar pneumonia often begins as a general sense of pressure and aching, usually localized to one side of the chest.  The pain begins around the time of the chills heralding the onset of the infection.  Later, as the process affects the pleura (tissues around the lung), pleuritic pain develops.  Patients with atypical pneumonia or bronchopneumonia may complain of a central burning sensation provoked by coughing.

Chronic/recent dry cough

Viral pneumonia often produces a dry cough at the beginning.  The cough usually becomes worse and produces a small amount of mucus.  Mycoplasma pneumonia is associated with a cough that tends to come in violent attacks, but produces only sparse whitish mucus.

Chronic/recent productive cough

A cough with phlegm is a common symptom of pneumoniaBacterial pneumonia involves a cough that usually produces rust-colored or greenish mucus.  Viral pneumonia often produces a dry cough at the beginning, which usually becomes worse and produces a small amount of mucus.

Conditions that suggest Pneumonia:

Symptoms - Respiratory

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Risk factors for Pneumonia:


Alcohol-related Problems

Alcoholism is a risk factor for the development of pneumonia.


Congestive Heart Failure

Heart failure is a risk factor for the development of pneumonia.


Weakened Immune System

People whose immune systems are suppressed, such as those with AIDS or those undergoing chemotherapy, are more susceptible to pneumonia.

Lab Values - Scans

Normal chest X-ray or recently-normalized chest X-rays

A chest X-ray is nearly always taken to confirm or rule out a pneumonia diagnosis.


Vitamin A Requirement

Vitamin A deficiency reduces the ability of the cells lining the lungs to remove disease-causing microorganisms, increasing risk of pneumonia.

Organ Health

Diabetes Type II

Diabetes is a risk factor for the development of pneumonia.


COPD (Chronic Obstructive Pulmonary Disease)

Lung diseases – such as chronic bronchitis and emphysema – are risk factors for the development of pneumonia.

Symptoms - Head - Mouth/Oral

Wearing clean/wearing dirty dentures all day or wearing dirty dentures while awake

October, 2014: A three-year study of 524 adults over the age of 85 and published in the Journal of Dental Research has found that patients who wear dentures during sleep are at 2.3 times higher risk for developing pneumonia than those who remove them.  The researchers also found that overnight denture wearing increased levels of tongue and denture plaque, gum inflammation, a positive culture for Candida albicans, and bad breath.

Dentures are covered in thin layers of bacteria known as biofilms, which can then be breathed into the lungs.  Two good methods of disinfecting dentures are to put them in a microwave for three minutes (unless they contain metal), or soak them in a solution of 2% chlorhexidine gluconate, a germicidal mouthwash, for 10 minutes.

Symptoms - Muscular

Being lean or underweight or being very skinny

Slender, older women are more susceptible to various chronic lung problems such as bronchitis, pneumonia and asthma.  A slim woman's relative lack of estrogen may lead to a weakened immune system.

Pneumonia suggests the following may be present:


Cigarette Smoke Damage

Smoking is a risk factor for the development of pneumonia.

Recommendations for Pneumonia:

Botanical / Herbal

Cayenne Pepper

Cayenne may have some supportive activity as an antimicrobial to help control infections such as pneumonia.

Digestive Aids


In a clinical study of 124 patients hospitalized with chronic bronchitis, pneumonia, bronchopneumonia, bronchiectasis, or pulmonary abscess, those receiving bromelain orally showed a decrease in the volume and pus-like quality of the sputum. [J Clin Invest 1985;75: pp.456-61]


Conventional Drug Use

Pneumonia caused by bacteria and mycoplasma is generally treated with antibiotics.  The type of antibiotic used depends on which organism has caused the infection.  If the infection is severe, and especially in very young and old people, the pneumonia may need to be treated in hospital with antibiotics and fluids given into a vein, and extra oxygen through a mask.

Fungal pneumonias are treated with specific antifungal drugs.

Laboratory Testing

Bacteria / Pathogen Testing by PCR

A Respiratory (Sinusitis/Pneumonia) Panel (Blood or Swab) can test for the presence of Mycoplasma fermentans, Mycoplasma pneumonia, Legionella pneumoniae and Chlamydia pneumoniae.


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