Patients sometimes suffer nausea, vomiting and diarrhoea.
Pneumonia can manifest without any cough or fever, particularly in elderly patients. Nevertheless, the clinical presentation varies considerably between patients. The above symptoms are not always evident in the elderly who can present nonspecific symptoms such as a lack of appetite, a decreased level of consciousness, the onset of urinary incontinence or rapid breathing (tachypnoea). Generally speaking the symptoms may appear either gradually, over two or three days, or very quickly, within a few hours.