Hi Olivia, there are many many diseases, some are genetic, others are related to the environment or our habits while others are caused by infectious agents.
Great question – I wonder if anyone’s actually tried to count them all up before?! I work on infectious diseases (ones that spread from one person or animal to another), and there are hundreds just in that category! Here’s a nice alphabetical list: https://www.atsu.edu/faculty/chamberlain/Website/diseases.htm
Some of them you’ll have heard of, but some might be new (there some here that even I haven’t heard of before!)
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