Emerging illnesses in India refer to diseases that have newly appeared in a population or diseases that were previously controlled but are increasing in incidence, geographic spread, or severity. These illnesses create major challenges for pandemic preparedness and response because they can spread rapidly, affect vulnerable populations, and require continuous surveillance and adaptive public health strategies. India has witnessed several emerging and re-emerging infectious diseases due to factors such as rapid urbanisation, population growth, climate change, increased travel and trade, environmental changes, and changes in human behaviour. Diseases such as COVID-19, Nipah virus infection, Zika virus disease, avian influenza, dengue, chikungunya, and antimicrobial-resistant infections demonstrate the changing epidemiological pattern of illnesses in the country. A major trend in emerging illnesses in India is the increasing frequency of outbreaks caused by novel pathogens. The COVID-19 pandemic highlighted the vulnerability of densely populated regions and demonstrated how quickly a new infectious disease can spread through communities. Similarly, outbreaks of Nipah virus in Kerala showed the importance of zoonotic diseases, where pathogens are transmitted from animals to humans. The increasing interaction between humans, wildlife, and livestock has created opportunities for new infections