When individuals develop pneumonia, their immune systems work overtime to contain and eliminate the infection. This over-stimulation can cause fatigue and lack of energy.
Some people with severe pneumonia also experience confusion, especially in conjunction with a high fever. It's important to seek medical attention if this happens.
As the infection decreases, these symptoms gradually fade as well. Full recovery can take a few weeks, however.

This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.