The Bible and mental illness?

What does the Bible say about mental illness? Now, I have read some of the bible, but not all of it. Work in progress for me. We had a get together over at my folks house the other day and my mother has a friend who I heard her mention her son and some issues he was having. She stated that the doctors had diagnosed him with bipolar, and wanted to put him on meds etc. However, my mothers friend then stated she read that in the Bible there was no mention of mental illness. But there were things mentioned such as sickness, disease, demon possession, and most of the time people with a "mental illness" all it is, is they have an unclean spirit. And that if people who were "sick" or had "unclean spirits" would find God, and ask for his help they would be cured. Thoughts? She stated that man, made up the word mental illness. So, do you believe if people who have bipolar or other mental illness issues, that it is likely they just have unclean spirits? She also believed that medications could harm people more than help them. Thoughts?

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