What makes you cross the line between mental illness and normal emotions?

Stress: The key is how well do you adapt to the emotions you are experiencing. It is the combination of the stress that causes your emotional upset, the severity of your emotions, and your ability to cope with those emotional shifts. Coping skills can make a difference. That is why we like the website moodsurfing.Com which focuses on teaching coping skills. But some emotions are too much for anyone.