In general, as long as one follows medical advice, recovery from a concussion is usually quite satisfactory, and it rarely leaves any long-term harm. Short-term harm can result in the patient experiencing some very painful symptoms such as headaches, dizziness, nausea, vomiting, etc. Such subjective experiences can comparatively make the patient suffer. For those who are emotionally excited or fragile, it may even lead to anxiety and depression, which are some of the recent damages. In the long term, some patients might experience a loss of memory, particularly short-term memory, which can also cause some inconvenience in their lives. However, overall, the damage from a concussion is very minimal, and as long as it is treated properly, there is generally no harm in the later stages.