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For 50% of people, post-concussion symptoms go away within a few days to several weeks after the original injury occurs. [59] In others, symptoms may remain for three to six months, [ 25 ] but evidence indicates that many cases are completely resolved within six months. [ 18 ]
But the recovery time can vary. Up to about 1/3 of people experience persisting symptoms after concussion (PHAC) or persistent post concussion symptoms (PPAC), defined as symptoms that last more than 4 weeks. [5] [6] [7] After an injury, concussion symptoms can begin immediately or be and delayed by 1-2 days at most. [8]
A concussion, also known as a mild traumatic brain injury (mTBI), is a head injury that temporarily affects brain functioning. [8] Symptoms may include headache, dizziness, difficulty with thinking and concentration, sleep disturbances, mood changes, a brief period of memory loss, brief loss of consciousness; problems with balance; nausea; blurred vision; and mood changes.
Timing is important to wound healing. Critically, the timing of wound re-epithelialization can decide the outcome of the healing. [11] If the epithelization of tissue over a denuded area is slow, a scar will form over many weeks, or months; [12] [13] If the epithelization of a wounded area is fast, the healing will result in regeneration.
A bruise, also known as a contusion, is a type of hematoma of tissue, [3] the most common cause being capillaries damaged by trauma, causing localized bleeding that extravasates into the surrounding interstitial tissues. Most bruises occur close enough to the epidermis such that the bleeding causes a visible discoloration.
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Computed tomography (CT scanning) is a more sensitive test for pulmonary contusion, [6] [33] and it can identify abdominal, chest, or other injuries that accompany the contusion. [38] In one study, chest X-ray detected pulmonary contusions in 16.3% of people with serious blunt trauma, while CT detected them in 31.2% of the same people. [ 45 ]
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