To spot these signs, trust yourself, your own feelings and behaviours: when you feel that something is wrong or that you are worried about a friend, it probably means that you have picked up on signs without realizing it. So pay attention and try to identify what made you feel that way about their behaviour. Signs that are loud and noticeable are easier to identify (crying, aggressiveness, weight loss, etc.). However, we must also be vigilant to the so-called "negative" signs that are more difficult to notice and that make us forget the person (withdrawal, silence, absence). Taken separately, these behaviours are not alarming, especially if they are transitory. For example, it is quite normal after a breakup to be sad, irritable or to have trouble sleeping. It is the accumulation of these signs or their sudden appearance that indicates the person is suffering.