Even if your head injury is only mild, you may have difficulty concentrating temporarily and may experience occasional headaches, dizziness and fatigue. This collection of symptoms is caused by a concussion. When symptoms are long-lasting, they are called "post-concussion syndrome." A concussion usually improves within three months.
A severe head injury can be fatal, or can require an extended hospital stay with prolonged rehabilitation. According to one large study, the average length of stay in a rehabilitation facility after severe head injury was 61 days. In some cases, disability is permanent.
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