Nowadays, people have focus on their job and want to develop their career to achieve higher and higher goals, consequently they pay less attention to their health which leads to some serious issues. Thus when they are ill or feel sick, they still go to work because they have sense of commitment and some responsibilities which they can not give up even if it can do harm to others or themselves. To my mind, it is better for people who feel bad to stay at home so that they and their colleagues will be safe.
Firstly, one of the main reasons why people should not to go to work when they are ill is that, first of all, it will be harmful for themselves. It can lead to big problems both with mental and physical health. For instance, one year ago in winter I did not take care of my state and went to work where I had to spend a lot of time outside which led to big troubles with my health and I was even taken to the hospital.
Secondly, it is important to take into account that sick people do not only harm themselves but can infect people around them. Moreover, if people are not aware about your health issues because you do not warn them, you can put them in a difficult position when they will find themselves ill after contact with you. To illustrate, once, my colleague came to the office knowing that he had coronavirus, and a week later our boss had to quarantine the office and transfer all the workers to remote work.
In conclusion, you should be responsible to yourself and others when you are sick because you can put a lot of people at risk including yourself. Additionaly, it is necessary to notify people about your health status before you want to go to some public places and especially when you want to go to work.