Common Cold: caused by some colonized virus, such as rhinovirus;

Influenza: caused by influenza virus;

COVID-19: caused by novel coronavirus.

Common Cold: It is not infectious. When the resistance decreases, some viruses colonized in the upper respiratory tract replicate, causing symptoms;

Influenza: infectious;

COVID-19: It is infectious, and its infectivity is significantly higher than that of influenza.

Common Cold: Usually in the upper respiratory tract, and generally will not cause pneumonia;

Influenza: Most of them are also in the upper respiratory tract, and may affect the lungs of the elderly with basic diseases;

COVID-19: It can lead to pneumonia. After contracting the COVID-19, it can cause a series of basic diseases to worsen. This is a very important feature of COVID-19 which cannot be ignored.

Common Cold: It is not seasonal, and the resistance declines, causing local virus reproduction, leading to symptoms;

Influenza: mainly in autumn and winter;

COVID-19: It can happen all year round, but autumn and winter are the high incidence seasons.

Common Cold: The symptoms are relatively mild. Generally, there are some symptoms of upper respiratory tract, such as runny nose and stuffy nose. Some people have low fever, but few have high fever;

Influenza: It often has systemic symptoms, such as headache, fever, sore throat, muscle and joint pain, etc.;

COVID-19: After virus infection, there may be fever, muscle joint pain, cough, decline of sense of smell, taste decline, etc., and it may also induce the aggravation of basic diseases, especially in the elderly.

Common Cold: no treatment, self limited, generally cured in 1-3 days;

Influenza: There is a specific drug, which can reduce symptoms and further complications through antiviral treatment;

COVID-19: At present, there are also antiviral drugs, so we should be more active in the treatment of COVID-19, especially for the elderly with basic diseases, we should intervene early to avoid deterioration of the disease, including antiviral treatment, oxygen therapy, traditional Chinese medicine and other comprehensive treatment.

普通感冒：由定植的一些病毒导致，如鼻病毒；

流感：流感病毒导致；

新冠：新冠病毒导致。

普通感冒：没有传染性，当抵抗力下降的时候，在上呼吸道定植的一些病毒复制，导致症状；

流感：具有传染性；

新冠：具有传染性，且传染性明显高于流感。

普通感冒：一般在上呼吸道，一般不会导致肺炎；

流感：大部分也在上呼吸道，极个别的，老年人有基础病的，可能会累及到肺脏；

新冠：可导致肺炎，新冠病毒感染以后可以诱发一系列基础病的加重，这是新冠的一个很重要特点，所以不能忽视。

普通感冒：没有季节性，一年四季都可以发生抵抗力下降造成出现局部病毒繁殖，导致症状；

流感：主要在秋冬季；

新冠：一年四季都可以发生，但秋冬季是高发季节。 

普通感冒：症状比较轻，一般有上呼吸道的一些症状，流鼻涕、鼻塞，个别的会有一些低热，很少有高热；

流感：常常是有全身的症状，如头疼、发热、咽喉痛、肌肉关节酸痛等；

新冠：病毒感染后可出现发热、肌肉关节酸痛、咳嗽、嗅觉、味觉下降等，还可能诱发基础病的加重尤其是老年人。

普通感冒：不治疗，本身自限，一般1-3天痊愈；

流感：有特效药，通过抗病毒治疗可以减轻症状，减少进一步并发症的发生；

新冠：目前也有抗病毒药，所以对新冠治疗更要积极，尤其是有基础病的老年人更要早期进行干预避免病情恶化，包括抗病毒治疗、氧疗、中药等综合治疗。