Early signs of a lung infection often mimic a cold or flu but last longer, including a persistent cough (with or without mucus/phlegm), fatigue, fever, chills, chest pain when breathing or coughing, and shortness of breath, sometimes accompanied by wheezing or body aches. Recognizing these signs early, like increased tiredness or a cough that won't quit, is crucial, especially if they worsen or you're in a high-risk group, warranting prompt medical attention.

What are the first symptoms of a lung infection?

Early symptoms are similar to influenza symptoms: fever, a dry cough, headache, muscle pain, and weakness. Within a day or two, the symptoms typically get worse, with increasing cough, shortness of breath and muscle pain. There may be a high fever and there may be blueness of the lips.

Can lung infection cause diarrhea?

Pneumonia is an infection that causes the air sacs in the lungs to fill up with fluid or pus, which makes it harder to breathe. The most common symptoms are cough that may be dry or produce phlegm, fever, chills and fatigue. Other symptoms may include nausea, vomiting, diarrhea, and pain in the chest.

What is a common lung infection in children?

Bronchiolitis is a common lung infection in young children and infants. It causes swelling and irritation and a buildup of mucus in the small airways of the lung. These small airways are called bronchioles. Bronchiolitis is almost always caused by a virus.

What is the most common lung disease in children?

Bronchiolitis is caused by a viral infection, most often respiratory syncytial virus (RSV). This is the most common lung infection in infancy. Most babies develop an RSV infection by the time they are 2 years old and, for most, the symptoms are similar to a common cold.

4 Warning Signs of Pneumonia

What are the first warning signs of pneumonia in children?

Kids with bacterial pneumonia usually get sick quickly and have a high fever, cough, rapid breathing and maybe even chest pain with breathing. Viral pneumonia symptoms tend to appear more slowly and may be less severe, though you can see fever and cough from viruses too. Wheezing is more common in viral pneumonia.

What are silent pneumonia symptoms?

Symptoms may include:

• Cough.
• Fever.
• Sore throat.
• Headache.
• Runny nose.
• Ear pain.
• Chest pain from coughing.

What is the new respiratory virus in 2025?

CDC first identified Subclade K in the United States in August 2025, and as of December 19, approximately 90% of influenza A(H3N2) viruses that CDC has genetically characterized from U.S. samples collected since September 28 were identified as subclade K.

What are red flags for pneumonia?

Symptoms of pneumonia

a cough – you may cough up yellow or green mucus (phlegm) shortness of breath. a high temperature. chest pain.

What are the symptoms of a lung abscess?

Early signs and symptoms of a lung abscess are similar to pneumonia and include fever, chills, cough, night sweats, dyspnea, weight loss, fatigue, chest pain, and occasionally anemia. Initially, the cough is nonproductive, but it becomes productive when bronchial communication develops, a hallmark sign of lung abscess.

When to go to the ER for lung infection?

If you or a loved one experiences difficulty breathing, chest pain, confusion, or a high fever that won't go down, these are signs that pneumonia is worsening. In such cases, it's crucial to visit an ER like Express ER Harker Heights to get urgent pneumonia care and prevent further complications.

What are the first signs of RSV?

People who become infected with RSV show symptoms within four to six days after the virus enter the body. Initial signs of RSV are similar to mild cold symptoms, including sneezing, runny nose, fever, cough and decrease in appetite. Very young infants may be irritable, fatigued and have breathing difficulties.

What is the new flu bug called?

Subclade K is a mutated variant of the influenza A (H3N2) virus and it's being called the “super flu.”

Which virus is spreading now in 2025?

As of 20 September 2025, CHIKV disease transmission continues across the Americas in line with expected seasonal patterns. A total of 228 591 suspected cases have been reported from 14 countries, including 100 329 confirmed cases and 115 deaths.

What are the first signs of bronchitis?

Early signs of bronchitis often mimic a cold, starting with a cough (which may bring up clear, yellow, or green mucus), fatigue, chest discomfort/tightness, mild fever, headache, body aches, runny/stuffy nose, and sometimes wheezing, with symptoms usually improving in a week or two, though the cough can linger. It's inflammation of the airways (bronchi), often following a viral illness.

What viruses are going around right now in adults?

• COVID-19.
• Seasonal Flu.
• Respiratory Syncytial Virus (RSV)

What is the danger stage of pneumonia?

The most common pneumonia complications are respiratory failure, sepsis, organ failure, bleeding problems, and worsening of existing medical conditions. When is pneumonia life-threatening? Pneumonia is life-threatening if it causes complications such as sepsis, septic shock, and organ failure.

Where is the back pain with pneumonia?

Pneumonia back pain manifests as unilateral sharp, stabbing discomfort or dull ache between the shoulder blades or mid back, worsening with breathing, coughing, and movement as the infected lung's inflamed pleura rubs against the chest wall.

Can I have pneumonia without a fever?

Can You Have Pneumonia Without a Fever? Yes, you can have pneumonia without a fever or cough. In elderly people, symptoms may be subtle, such as having chills but no fever or struggling to bring up phlegm.

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