"concentration problems" is correct and usable in written English.
You can use it when discussing the difficulties someone is having focusing or paying attention. For example, "Due to his concentration problems, John has been struggling to focus on his assignments."
For the four adopted children, the effects of abuse still linger in behavioral and concentration problems.
"People who can't switch off … have sleeping problems, concentration problems, and other issues.
According to court testimony, Patrick was disorganized in school, had concentration problems and needed constant supervision.
Negative moods substantially increased, and concentration problems increased slightly.
About 30percentt of children who have received this chemotherapy end up with learning or concentration problems, Dr. Butler said.
But his memory and concentration problems remained, leading the doctors to suspect that these may be permanent disabilities.
They develop "concentration problems" in class and sabotage their chances in exams by day-dreaming, falling asleep or walking out.
But the nightmares, concentration problems and heightened state of alertness usually go away in a few weeks.
Not only are kids destined to become fat and thuggish, it seems, but early exposure to TV is going to make them prone to concentration problems at school.
Insomniacs often complain of fatigue-related problems, including concentration problems, memory difficulties, and poor performance (reviewed in Costa e Silva et al, 1996; Walsh and Ustun, 1999).
Sometimes the only symptoms are changes in mental and other behaviors, including memory loss, impaired concentration, problems with speech and reasoning, and general confusion.
