Lately karim has been having trouble sleeping. when his mother asks what is bothering him he is unable to pinpoint anything in particular. he says that he is worried about the future. it can be said that karim is suffering from:

Anxiety

Explanation:

    Anxiety is the feeling of anticipation of some future threat. It is very associated with fear and generates feelings of tension.  It is important to note that anxiety is an emotional response brought on by fear. But the classic fear, the one that we feel when we get scared of a movie, for example, is something momentary that happens when we identify some danger.  With anxiety is different; it is a constant sense of fear about the future, a fear that something might happen. Because of this, this psychic state does not cease easily as it cannot escape from what is causing it.  For people with this condition, many common situations would cause extreme stress, physical and psychological tension.