肺炎发生在青壮年和儿童身上症状一般比较明显,但发生在老年人身上情况就不同了,老年人由于全身和局部适应性降低,往往缺乏通常那些典型的症候,例如老年性肺炎患者体温正常者达40～50％,而且即使发热也大多数都是轻中度的发热,只有半数的人有咳嗽和咳痰,另有半数的人则出现腹痛、腹泻等消化道的症状,有的还出现尿频、尿失禁、脱水、情绪异常、心率不稳和休克等症状,大约有半数的人白细胞并不高。 Pneumonia occurs in young adults and children with symptoms generally obvious, but the situation occurs in the elderly are different, the elderly due to systemic and local adaptive decreased, often the typical lack of those typical symptoms, such as normal temperature in patients with senile pneumonia Up to 40 ~ 50%, and even if the fever is mostly mild to moderate fever, only half of people have cough and sputum, while the other half appear abdominal pain, diarrhea and other gastrointestinal symptoms, and some also appear Frequent urination, urinary incontinence, dehydration, mood disorders, unstable heart rate and shock symptoms, about half of people are not high white blood cells.