Pneumonia symptoms can vary but often include a persistent cough, which may produce phlegm or mucus. Individuals may also experience chest pain, especially when breathing or coughing, along with shortness of breath and fatigue. Fever and chills are common, and some may have a rapid heartbeat. In addition to these symptoms, pneumonia can cause confusion, particularly in older adults. Other signs may include nausea, vomiting, or diarrhea. If you or someone you know exhibits these symptoms, it is important to seek medical attention, as pneumonia can be serious and may require treatment with antibiotics or other medications.