人间四月天,温差大,雨水多,时雨时晴,离奇无常,使人体很难适应。而中老年人由于年岁大、免疫力低下等原因,极易患发疾病,影响生活。四月易发的病症感冒气候变暖是导致感冒高发的原因。对于中老年人来说,体弱、多病、营养不良、免疫功能低下、过度疲劳等均可降低呼吸道局部抵抗 April human days, the temperature difference, rain, when the rain is clear, bizarre, so that the human body is difficult to adapt. The elderly due to age, low immunity and other reasons, vulnerable to disease, affect life. April prone illness cold flu warming is caused by a high incidence of colds. For the elderly, frailty, sickness, malnutrition, immune dysfunction, fatigue, etc. can reduce the local resistance of the respiratory tract