Feeling crap can have many causes, both psychological and physical. It is a common experience for people to feel sad, angry, stressed or fed up at times. Identifying triggers and talking to others can help deal with feeling crap. Taking care of yourself by exercising, getting enough sleep, spending time with friends, and avoiding drugs/alcohol can help improve your mood. Speaking to a counselor or doctor is also recommended if feeling crap persists or its cause is unclear.