(HealthDay News) -- A jarring and forceful blow to the head can result in a brain injury called a concussion.

The American Academy of Family Physicians lists the following warning signs of concussion, which should be evaluated as soon as possible by a doctor:

* Headache.
* Difficulty seeing.
* Dizziness.
* Difficulty concentrating, memory loss or confusion.
* Problems retaining balance.
* Nausea.
* Ringing in the ears.

TUESDAY, Aug. 26 (HealthDay News) -- Imagine you're in a foreign country where learning the language is incredibly hard, if not impossible.

No one understands what you're saying. You can't comprehend a word. The best you can do is point and gesture, and hope the other person understands what you're trying to get across.

You're now in a position to better understand what a person suffering from aphasia goes through on a daily basis. Caused by injury to the brain, often due to stroke, aphasia affects the production or comprehension of speech, be it verbal or written.

TUESDAY, June 24 (HealthDay News) -- The Alzheimer's drug memantine (brand name Namenda) may help reduce a form of brain injury that affects many premature babies, according to a Children's Hospital Boston study.

Hypoxic-ischemia, a compromise of the brain's blood and oxygen supply, can lead to cerebral palsy and cognitive/behavioral problems.

In experiments with rats that had brain injury similar to that seen in some premature infants, the Children's Hospital team found memantine could reduce damage to cells called oligodendrocytes, which form the brain's white matter.

MONDAY, June 23 (HealthDay News) -- In 2005, traumatic brain injuries (TBIs) due to falls resulted in nearly 8,000 deaths and 56,000 hospitalizations among Americans age 65 and older, according to a U.S. Centers for Disease Control and Prevention study.

TBIs accounted for 50 percent of all unintentional fall deaths and 8 percent of nonfatal fall-related hospitalizations among older adults.

THURSDAY, May 29 (HealthDay News) -- Stroke patients who suffer seizures are more likely to die within 30 days than stroke patients who don't have seizures are, a new study shows.