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  1. Pneumonia Symptoms and Warning Signs - WebMD

    Apr 8, 2024 · Early signs, such as fever, dry cough, headache, and weakness, will look like the flu but get worse in a day or two. You'll cough more and have shortness of breath and muscle pain.

  2. Pneumonia: Causes, Symptoms, Diagnosis & Treatment

    Pneumonia is a lung infection caused by bacteria, viruses or fungi. Fluid and inflammation in your lungs makes breathing hard and causes fever and other symptoms.

  3. What Does Pneumonia Feel Like? - Health

    Jul 13, 2025 · The signs and symptoms of pneumonia include chest pain, difficulty breathing, and fatigue. Pneumonia can have overlapping symptoms with colds and flus but can be life …

  4. Pneumonia - Symptoms and causes - Mayo Clinic

    Jun 13, 2020 · 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, …

  5. Pneumonia Symptoms and Diagnosis - American Lung Association

    Aug 14, 2025 · Pneumonia is an infection that inflames your lungs' air sacs (alveoli). The air sacs may fill up with fluid or pus, causing symptoms such as a cough, fever, chills and trouble …

  6. Top 10 Early Warning Signs of Pneumonia (2025) - Respiratory …

    Sep 17, 2025 · Explore the early warning signs and symptoms of pneumonia to detect this serious lung infection, improving recovery and overall health.

  7. Pneumonia Symptoms: How to Recognize Early Warning Signs

    Dec 19, 2025 · Pneumonia symptoms can vary widely from a mild flu to a life-threatening emergency. Cough, fever, and fatigue are common, but you should seek help for more serious …

  8. Pneumonia - Symptoms | NHLBI, NIH

    Mar 24, 2022 · The symptoms of pneumonia can be mild or serious. Young children, older adults, and people who have serious health conditions are at risk for developing more serious …

  9. Pneumonia: Symptoms, Causes, and Treatment - Harvard Health

    Jun 24, 2024 · Most cases of pneumonia are caused by bacteria or viruses, but pneumonia can also be caused by fungi. The symptoms of pneumonia can range from mild to severe, and …

  10. Pneumonia | Infectious Diseases - UC Davis Health

    Aug 18, 2023 · Pneumonia symptoms can range from mild to severe, depending on your age, other health conditions and the type of germ that caused pneumonia. Common Symptoms of …