India, Jan. 30 -- With January coming to an end, the flu season is at the door. Though we may not wish to answer it, in a populous country like ours, one is seldom safe from the influenza virus, which is usually responsible for the common flu.

According to the World Health Organisation (WHO), there are nearly a billion cases of the flu annually, even though many recover without treatment. However, taking to Instagram on January 29, Dr Dmitry Yaranov, a cardiologist and heart-transplant specialist with expertise in advanced heart failure and mechanical circulatory support, cautioned that one should not always take the disease lightly.

According to the WHO website, the symptoms of the common flu begin two days after a person has been infe...