I agree.
When a person is in so much physical pain it can cause a person to be disabled temporary or permanently.
Then it can lead to depression. Due to the person can not do or enjoy the things they used to.
I injured my back a few years back. That was the worst pain I have ever experienced. I could not walk or move due to the pain was severe. Talking about hitting a nerve. I often suffer from back pain but never to that extent.
I was bed ridden for two weeks and I cried a lot. Not because of the pain. But due to I could not get up and do the things I wanted to do and the feeling of being helpless overcame me. I got really depressed.
That reminds me: my mother had open heart surgery recently. As expected, the pain was EXCRUCIATING! However, the nurse told me to watch for post-op depression, which often times does lead to suicide. Therefore, extreme physical pain does lead to emotional pain, sometimes to the point of suicide.