Self harm has many forms.
It can include the physical, like cutting and burning or punching walls, all things that I have done before when my self love has been low and my self loathing high.
It can include the mental, self doubting talk for example. A regular occurance.
It also can include other things that don't do you any good, such as not exercising, not eating or not eating healthily and engaging in other things that do you harm, such as drugs or drink.
Some signs of self harm are easier to spot than others.
Self harm can also be a sign of stress (and of course depression / other MH conditions). I've written before about how stress affects the decision making part of your brain, this bit that may convince me that instead of a healthy balanced diet that will make me feel better and feel my body what it needs that instead I should eat junk food, white magnums and drink too much.
When you are stressed and making bad decisions, or not thinking straight you need to realise it, or you need help from others to help you realise it and help you through the tough patch.
With some bits of self harm like not eating, that might be making sure your friend eats. Taking them to lunch. Sometimes it's as simple as that to help.
Mr Paul Wyse