Suicidal people often feel very isolated, while feeling unable to make contact even with people who are supposedly close with them. Having suicidal thoughts does not necessarily mean you're mentally ill. People who attempt suicide are often severely distressed over real issues that seem insoluble. In some cases, the distress turns to depression. A reactive depression is an extreme reaction to a difficult or tragic situation is someone's life.
Endogenous depression is usually the result of a chemical imbalance in the brain.
Some people may have one or the other, or even a combination of the two types. Most people who commit suicide don't have a diagnosable mental illness. They are people just like you and your friends who, at a particular time, are feeling isolated, desperately unhappy, and helpless to affect their situation. Suicidal thoughts and actions may be a result of stresses and losses the person feels unable to cope with. Talking about someone's feelings and wishes to commit suicide can promote understanding and support, and can greatly reduce the immediate distress of the suicidal person.