So many reasons...
It's a job where you can help people and make a difference.
There is lots of communication in medicine and interacting with patients.
The variety-receiving a general training before being able to specialise in one area you really like
The challenge- becoming a doctor is a job where you continually can learn and problem solve.
It's really practical.
Many people are encouraged to study medicine for personal reasons or have parents who are doctors who inspire them.
Did I miss anything?
It's very hands on.
If you love science and the human body- being able to study anatomy in medicine is a big part.
You can workman environment where there is loads of teamwork.