The common cold is caused by a virus, while an allergy is a reaction of our immune system to a foreign agent, as it usually may be the case with pollen, cat hair, dust and other pathogens. The common cold is a transient condition and you should avoid being near an infected person, while it is not the case with allergies.
The cold lasts 7-10 days and usually occurs in autumn and winter, while allergy is a seasonal phenomenon and lasts much longer, even a couple of months.
In colds, the typical clinical picture is the appearance of muscle pain, sometimes fever, productive cough, sneezing followed by nasal secretions that can be thick and yellowish. Allergies are usually dominated by eye and throat itching, nasal secretions have a different appearance, it is more watery and transparent, the cough is dry and usually occurs at night or before morning, sneezing is much more common, and even disturbs the performance of daily duties.
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