National Institute of Health declared that every year almost 1 billion Americans suffering from cold and among them almost 5 to 20 percent US population acquire the flu symptoms. 
Nigella sativa or black seed, which is traditionally considered as a natural remedial for all the diseases except death has preventive and curative effect against cold and flu.
There is evidential research backing the mechanism of action of Nigella sativa against cold and flu. In this article, we provide all the research evidence, which explain how Nigella sativa can treat your cold and flu effectively.
General discussion of cold and flu
Both cold and flu are viral infections and have similar symptoms, but flu is more severe than cold. Because untreated conditions lead to pneumonia and may require hospitalization.  The common symptoms associated with cold and flu are coughing, sneezing, body ache, feverish and general malaise.