病
This Chinese character means disease, illness, sickness.
You can watch how to write this. - (「病」の書き順（筆順）動画 - 漢字書き順辞典)
There are 2 main ways to read this, "びょう" or "やまい".
"病気 (びょうき)" also means disease, illness, sickness.
"気 (き)" means gas, air, atmosphere, mood, some kind of human energy.
"病院 (びょういん)" means hospital.
"病（やまい）は気（き）から" is a famous Japanese proverb.
It means disease starts in mind.
Indeed, the way our mind works affects our body.
For example, depression is a mental illness.
Our body is a very complex system or network.
Even with the development of science and technology, there are still many unanswered questions about our bodies.
By Higashi-Mikawa Kyōjindō Shujin (東三河狂人堂主人)