Annual incidence of MTBI by age group in Canada Most cases of traumatic brain<unk>  are concussions. A World Health Organization (WHO) study estimated that between 70 and 90% of<unk> <unk> es that receive treatment are mild. However, due to under reporting and to the widely varying definitions of concussion and mTBI, it is difficult to estimate how common the condition is. Estimates of the incidence of concussion may be artificially low, for example, due to under reporting. At least 25% of mTBI sufferers fail to get assessed by a medical professional. The WHO group reviewed studies on the epidemiology of mTBI and found a hospital treatment rate of 1–3 per 1000 people, but since not all concussions are treated in hospitals, they estimated that the rate per year in the general population is over 6 per 1000 people. Age Young children have the highest concussion rate among all age groups. However, most people who suffer a concussion are young adults. A Canadian study found that the yearly incidence of mTBI is lower in older age groups (graph at right). Studies suggest males suffer mTBI at about twice the rate of their female counterparts. However, female athletes may be at a higher risk of suffering a concussion than their male counterparts. Sports Up to five percent of sports<unk> es are concussions. The U.S. Centers for Disease Control and Prevention estimates that 300,000 sports-related concussions occur yearly in the U.S., but that number includes only athletes who lost consciousness. Since loss of consciousness is thought to occur in less than 10% of concussions, the CDC estimate is likely lower than the real number. Sports in which concussion is particularly common include American football, the rugby codes, mma and boxing (a boxer aims to "knock out", i.e. give a mild traumatic brain<unk>  to, the opponent). The<unk>  is so common in the latter that several medical groups have called for a ban on the sport, including the American Academy of Neurology, the World Medical Association, and the medical associations of the UK, the US, Australia, and Canada. Workplace Concussions may also be common and occur in the workplace. According to the US Bureau of Labour Statistics, the most common causes of mTBI-related hospitalizations and deaths from the workplace are falls, force of heavy objects, and vehicular collisions. As a consequence, jobs in the construction, transportation, and natural resource industries (eg. agriculture, fishing, mining) have more elevated mTBI incidence rates ranging from 10–20 cases per 100 000 workers. In particular, as vehicular collisions are the leading cause of workplace mTBI-related<unk> es, workers from the transportation sector often carry the most risk. Despite these findings, there still remain important gaps in data compilation on workplace-related mTBIs, which has raised questions about increased concussion surveillance and preventive measures in private industry.
types of Head injury
symptom of Stroke
medical cause of Infection
symptom of Birth defect
History of neurology and neurosurgery
symptom of Cardiovascular disease
symptom of Congenital heart defect
symptom of Subarachnoid hemorrhage