Difficulty concentrating may be a symptom of fatigue, sleep apnea, sleep disorders, drowsiness, anxiety, anemia, alzheimer's disease, cirrhosis, kidney disorder, cardiomyopathy, depression, dysthymia, huntington's disease, insomnia, lyme disease, heavy metal poisoning, multiple sclerosis, wagr syndrome, schizophrenia and premenstrual syndrome. To learn more about the cause of your symptoms, click on each of the diseases listed below.
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