In light of Hillary Clinton's diagnosis, here's everything you need to know about pneumonia

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Pneumonia is one of the most common illnesses in the U.S.

The lung infection puts about 1 million adults in the hospital every year, and it can get pretty serious -- about 50,000 die from it.

Hillary Clinton's doctor confirmed Sunday that the Democratic presidential candidate is being treated for the disease. It's unclear how she got infected.

SEE MORE: How Much Do We Need To Know About The Presidential Candidates' Health?

Pneumonia can be caused by bacteria, a virus or fungi. When a person becomes infected, the lungs fill with fluid and make breathing difficult.

Anyone can get pneumonia, but older adults, children and people with chronic illnesses are more susceptible.

The most common symptoms are coughing, fever, shaking chills and shortness of breath -- but some people experience loss of appetite, fatigue, confusion, profuse sweating and influenza symptoms.

Treatment depends on several factors, including the cause of the infection, how severe the symptoms are and the patient's age and overall health.

Most cases aren't that serious and can be treated at home with plenty of fluids, rest and aspirin to control any fever.

However, some patients need to be hospitalized and given fluids through an IV, antibiotics, oxygen therapy and possibly breathing treatments.

If left untreated, pneumonia can cause respiratory failure, sepsis and even death.

Pneumonia itself is not contagious, but the germs that cause it are -- and they can spread from person to person pretty easily.

In Clinton's case, a source told People that several members of her campaign have also been sick in recent days.

PHOTOS: Hillary Clinton overheats at 9/11 event

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Clinton overheats at 9/11 event
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Clinton overheats at 9/11 event
NEW YORK, NY - SEPTEMBER 11: Democratic presidental nominee former Secretary of State Hillary Clinton arrives with an unidentified woman at the September 11 Commemoration Ceremony at the National September 11 Memorial & Museum on September 11, 2016 in New York City. Hillary Clinton left a September 11 Commemoration Ceremony early after feeling overheated and went to her daughter's house to rest. (Photo by Justin Sullivan/Getty Images)
TOPSHOT - Democratic presidential nominee Hillary Clinton leaves a memorial service at the National 9/11 Memorial September 11, 2016 in New York. The United States on Sunday commemorated the 15th anniversary of the 9/11 attacks. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
U.S. Democratic presidential candidate Hillary Clinton, New York Mayor Bill de Blasio (R) and U.S. Senator Chuck Schumer attend ceremonies to mark the 15th anniversary of the September 11 attacks at the National 9/11 Memorial in New York, New York, United States September 11, 2016. REUTERS/Brian Snyder
NEW YORK, NY - SEPTEMBER 11: Democratic presidental nominee former Secretary of State Hillary Clinton attends the September 11 Commemoration Ceremony at the National September 11 Memorial & Museum on September 11, 2016 in New York City. Hillary Clinton and Donald Trump attended the September 11 Commemoration Ceremony. (Photo by Justin Sullivan/Getty Images)
U.S. Democratic presidential candidate Hillary Clinton attends ceremonies to mark the 15th anniversary of the September 11 attacks at the National 9/11 Memorial in New York, New York, United States September 11, 2016. REUTERS/Brian Snyder
U.S. Democratic presidential candidate Hillary Clinton leaves ceremonies marking the 15th anniversary of the September 11 attacks at the National 9/11 Memorial in New York, New York, United States September 11, 2016. REUTERS/Brian Snyder
U.S. Democratic presidential candidate Hillary Clinton arrives for ceremonies to mark the 15th anniversary of the September 11 attacks at the National 9/11 Memorial in New York, New York, United States September 11, 2016. REUTERS/Brian Snyder
U.S. Democratic presidential candidate Hillary Clinton and New York Mayor Bill de Blasio (R) attend ceremonies to mark the 15th anniversary of the September 11 attacks at the National 9/11 Memorial in New York, New York, United States September 11, 2016. REUTERS/Brian Snyder
U.S. Democratic presidential candidate Hillary Clinton, New York Mayor Bill de Blasio (R) and U.S. Senator Chuck Schumer attend ceremonies to mark the 15th anniversary of the September 11 attacks at the National 9/11 Memorial in New York, New York, United States September 11, 2016. REUTERS/Brian Snyder
Democratic presidential nominee Hillary Clinton leaves a memorial service at the National 9/11 Memorial September 11, 2016 in New York. The United States on Sunday commemorated the 15th anniversary of the 9/11 attacks. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
NEW YORK, NY - SEPTEMBER 11: Democratic presidental nominee former Secretary of State Hillary Clinton (C) attends the September 11 Commemoration Ceremony with New York city mayor Bill de Blasio (R) and U.S. Sen. Chuck Schumer (D-NY) (L) at the National September 11 Memorial & Museum on September 11, 2016 in New York City. Hillary Clinton and Donald Trump attended the September 11 Commemoration Ceremony. (Photo by Justin Sullivan/Getty Images)
Democratic presidential candidate Hillary Clinton arrives to attend a ceremony at the National September 11 Memorial, in New York, Sunday, Sept. 11, 2016, on the 15th anniversary of the Sept. 11 attacks. (AP Photo/Andrew Harnik)
NEW YORK, NY - SEPTEMBER 11: Democratic presidental nominee former Secretary of State Hillary Clinton leaves the home of her daughter Chelsea Clinton on September 11, 2016 in New York City. Hillary Clinton left a September 11 Commemoration Ceremony early after feeling overheated and went to her daughter's house to rest. (Photo by Justin Sullivan/Getty Images)
US Democratic presidential nominee Hillary Clinton leaves her daughter's apartment building after resting on September 11, 2016 in New York. Clinton departed from a remembrance ceremony on the 15th anniversary of the 9/11 attacks after feeling 'overheated,' but was later doing 'much better,' her campaign said. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
U.S. Democratic presidential candidate Hillary Clinton leaves her daughter Chelsea's home in New York, New York, United States September 11, 2016, after Clinton left ceremonies commemorating the 15th anniversary of the September 11 attacks feeling "overheated." REUTERS/Brian Snyder TPX IMAGES OF THE DAY
U.S. Democratic presidential candidate Hillary Clinton leaves ceremonies marking the 15th anniversary of the September 11 attacks at the National 9/11 Memorial in New York, New York, United States September 11, 2016. REUTERS/Brian Snyder TPX IMAGES OF THE DAY
NEW YORK, NY - SEPTEMBER 11: Democratic presidental nominee former Secretary of State Hillary Clinton leaves the September 11 Commemoration Ceremony at the National September 11 Memorial & Museum on September 11, 2016 in New York City. Hillary Clinton and Donald Trump attended the September 11 Commemoration Ceremony. (Photo by Justin Sullivan/Getty Images)
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Fortunately, protecting yourself from pneumonia is pretty simple.

Doctors recommend getting a flu shot every year, washing your hands, refraining from smoking and being aware of your general health.

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