What's fogging up focus?Like a computer that slows with use, the brain accumulates wear and tear that affects processing. This can be caused by a number of physiological stressors such as inflammation, injury to blood vessels (especially if you have high blood pressure), the buildup of abnormal proteins, and naturally occurring brain shrinkage.The following factors can also affect your concentration.Underlying conditions. Depression or sleep disorders (such as sleep apnea) can undermine your ability to concentrate. So can the effects of vision or hearing loss. You waste precious cognitive resources when you spend too much time trying to make out what's written on a page or just hear what someone is saying.Medication side effects. Some drugs, especially anticholinergics (such as treatments for incontinence, depression, or allergies), can slow processing speed and your ability to think clearly.Excessive drinking. Having too much alcohol impairs thinking and causes interrupted sleep, which affects concentration.Information overload. We are bombarded with information from TVs, computers, and messages such as texts or emails. When there's too much material, it burdens our filtering system and it's easy to get distracted.