What is Anger according to Bhagavad Gita?

When an object has charmed one to a point of deep attachment, and when fear of its loss has started coming up in waves to disturb the individual, then, such an individual’s attitude towards those that come between him and the object of his attachment is called ‘anger.’

Anger is thus nothing but a feeling that rises in us towards an obstacle between ourselves and the object of our attachment; the anger thus arising within is directly proporotional to the amount of fear one entertains on the score of the obstacle holding one back from winning one’s object of love.

Anger, therefore, is only our attachment for an object, expressed at an obstacle that has come between us and the object of our desire.
(Source: Holy Gita – Ready reference – Published by Chinmaya International Foundation)