A subdural hemorrhage (or hematoma) is a type of bleeding that often occurs outside the brain as a result of a severe head injury. It takes place when blood vessels burst between the brain and the leather-like membrane that wraps around the brain (the dura mater). The pooling blood creates pressure on the surface of the brain, causing a variety of problems. Subdural hemorrhage symptoms depend on how quickly blood collects inside the skull. In an acute hemorrhage, signs and symptoms will usually appear immediately. With chronic hemorrhaging, leaking blood collects more slowly, and it can take weeks or months for symptoms to appear. Often, the cause is a minor incident that doesn’t stand out as being particularly harmful. Chronic hemorrhaging is more common in older adults, who may develop symptoms that mimic a stroke or dementia. A subdural hematoma occurs when a blood vessel near the surface of the brain bursts. Blood builds up between the brain and the brain's tough outer lining. The condition is also called a subdural hemorrhage. In a subdural hematoma, blood collects immediately beneath the dura mater. The dura mater is the outermost layer of the meninges. The meninges is the three-layer protective covering of the brain. A subdural hematoma is a life-threatening problem because it can compress the brain. Most subdural hemorrhages results from trauma to the head. The trauma damages tiny veins within the meninges. In young, healthy people, bleeding usually is triggered by a significant impact. This type of impact might occur in a high-speed motor vehicle accident. In contrast, older people may bleed after only a minor trauma. For example, it might happen from falling out of a chair. An acute subdural hemorrhage is bleeding that develops shortly after a serious blow to the head. Blood accumulates rapidly, causing pressure to rise within the brain. This can result in loss of consciousness, paralysis or death. When bleeding develops slowly, it is known as a chronic subdural hemorrhage. Bleeding may develop over a period of weeks to months Citations are important for a journal to get impact factor. Impact factor is a measure reflecting the average number of citations to recent articles published in the journal. The impact of the journal is influenced by impact factor, the journals with high impact factor are considered more important than those with lower ones. This information can be published in our peer reviewed journal with impact factors and are calculated using citations not only from research articles but also review articles (which tend to receive more citations), editorials, letters, meeting abstracts, short communications, and case reports.