LoginIllness vs. Disease
What Is Their Main Difference?
Both refer to being sick and not feeling well. Their only difference is that 'diseases' are mainly caused by bacteria and can be contagious and that we use the term 'disease' for other non-human creatures, and illness is only used for human beings.
Differences
We can say that bacteria mainly cause 'diseases' so they can pass on from one creature to another. Also, non-human creatures like plants and animals can have diseases, but not illnesses. Look at the examples below:
We have learned about many heart diseases this week.
She has been struggling with this illness for a long period of time.
Similarities
As stated above, these two are somehow similar in that they both refer to a creature that is not feeling well. Take a look at the following examples:
Today we're gonna focus on some of the diseases common among cats and dogs.
I've recently been showing signs of a weird illness.
Are They Interchangeable?
Most people use them interchangeably. Although remember that non-human creatures do not have illnesses, they have diseases. Compare:
✓ What are the common symptoms of this illness?
✓ What are the common symptoms of this disease?
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