Pneumonia symptoms typically include cough, fever, chills, shortness of breath, and chest pain that worsens when you breathe or cough. Most people also experience fatigue, and some develop nausea, vomiting, or diarrhea. But the specific combination of symptoms you experience depends on your age, overall health, and whether a virus or bacteria caused the infection.
The Core Symptoms
The hallmark symptoms of pneumonia are a persistent cough, fever with sweating and chills, shortness of breath, and fatigue. Chest pain is common too, typically sharpening when you take a deep breath or cough. Some people lose their appetite or feel nauseated. Confusion can also occur, particularly in older adults.
Fever can climb as high as 105°F in severe cases, and your breathing and pulse rate may speed up noticeably. If your lips or fingertips take on a bluish tint, that signals your blood isn’t carrying enough oxygen, and you need emergency care immediately.
Bacterial vs. Viral Pneumonia
Bacterial pneumonia tends to be more severe and can hit suddenly. Fever runs high (up to 105°F), and the cough often produces yellow, green, or even bloody mucus. Symptoms may appear within a day or worsen rapidly over the first 48 hours, with increasing shortness of breath and muscle pain.
Viral pneumonia usually develops more gradually over several days and often produces a dry cough rather than one filled with mucus. It’s generally milder and sometimes resolves on its own, though it can still become serious in vulnerable people. You might also notice a sore throat and headache early on, symptoms that overlap more with a typical cold.
What Mucus Color Actually Tells You
Many people assume green or yellow mucus automatically means a bacterial infection. There is a loose correlation: studies show discolored sputum has about a 79% chance of being present during a bacterial infection. But green and yellow mucus can also appear with viral infections, because the color comes from immune cells your body releases regardless of the cause. Mucus color alone isn’t reliable enough to determine whether you need antibiotics.
Walking Pneumonia Feels Different
Walking pneumonia, most often caused by a bacterium called Mycoplasma pneumoniae, earns its nickname because people with it often feel well enough to stay on their feet. Symptoms are milder: a low-grade fever, a cough that slowly worsens over days or weeks, fatigue, a sore throat, and headache. You might feel like you have a stubborn chest cold that just won’t clear up rather than a serious lung infection. The cough tends to be dry and persistent, sometimes lingering for weeks even after you start feeling better overall.
Symptoms in Children and Infants
Young children with pneumonia may show the same cough and fever adults experience, but infants can be harder to read. Newborns sometimes show no obvious signs of infection at all. Others may vomit, seem unusually restless or listless, or have visible difficulty breathing and eating. In small children, nausea and vomiting are more prominent than they are in adults. If a baby is breathing faster than normal, seems to be working hard to breathe (you might notice the skin pulling in between or below the ribs), or refuses to eat, those are signals worth acting on quickly.
Why Pneumonia Looks Different in Older Adults
Older adults often don’t develop the textbook symptoms. Fever and productive cough, the two signs most people associate with pneumonia, may be mild or completely absent. Instead, the most noticeable change might be sudden confusion, increased apathy, or even brief episodes of unconsciousness. Diarrhea can also be a leading symptom rather than a side note.
Body temperature in elderly patients can swing in either direction: spiking above 104°F or, paradoxically, dropping below 95°F. Both extremes are warning signs. Because the classic symptoms are often missing, pneumonia in older adults is frequently caught later than it should be. A sudden change in mental sharpness or energy level in someone over 65 deserves attention even if there’s no cough or fever.
Signs That Pneumonia Is Getting Worse
Most pneumonia follows a predictable arc: symptoms worsen over the first few days, then gradually improve with treatment. But some cases develop complications. A sharp, stabbing chest pain that intensifies with every breath or cough can indicate fluid buildup between the lung and chest wall, a condition called pleural effusion. This fluid can become infected itself, forming an abscess that may need to be drained.
Seek immediate help if you notice bluish discoloration of your lips or fingernails, difficulty breathing that’s getting worse rather than better, a fever that won’t come down, chest pain that feels severe, or a cough that’s producing increasingly bloody mucus. Rapid breathing (30 breaths per minute or more, compared to the normal 12 to 20) and a drop in blood pressure are also red flags, though these are harder to measure at home.
How Long Symptoms Last
With appropriate treatment, some people feel better and return to normal routines within one to two weeks. For others, full recovery takes a month or longer. Fatigue is the most stubborn symptom: most people continue feeling tired for about a month even after the cough and fever have resolved. This lingering exhaustion catches many people off guard, especially if they felt like they were recovering quickly in the first week or two.
The cough itself can persist for several weeks after the infection clears, particularly with walking pneumonia. This doesn’t necessarily mean the infection is still active. Your airways need time to heal, and irritation can trigger coughing long after the bacteria or virus is gone. If your cough is getting worse rather than gradually improving after the first week of treatment, or if fever returns after initially breaking, those patterns suggest the infection isn’t resolving as expected.