There are actually a lot of reasons why one would commit suicide these days.
Poverty or financial instability is the most common reason these days. Especially when that individual has been on the upside of finance. There also another common reason like bullying, which is common amongst teenagers as they feel that's the best way to end it all as the bully or bullies would never stop. Relationship issues, starting with breakups and abuses in the relationship. That's also common. Also there is pain and suffering especially due to health challenges. Abuse from spouse or friends either verbally or physical. Confusion about what's next in life. Imagine one without direction, that person is prone to suicidal thoughts. Depression is also common. Due to a lot of reasons, one could go into depression and then suicide. There are a lot of reasons today but these are basic and common I think.