Mental Fog can be caused by disorders such as depression but it can also be caused by daily things such as lack of sleep as well. It is a feeling as if your brain is functioning slowly, and you are in a state much like that induced by some drugs and medications which make you feel like you metaphorically walking through a thick fog, hard to make connections, recognize things around you or think clearly.
the responder that replied before me gave an accurate description of the feeling of mental fog. I wanted to add one more common reason for it ( well, it's more common than many know) and that it's cause is often brought on by a rise in blood ammonia levels. for now,only one medicine can help. around the world and in the u.s. especially,we have a kind of silent epidemic of hepatitis-c. this liver illness can cause skyrocketing ammonia in the blood. hep-c is not an essily transferred virus. still,we all ought to be aware that blood exchange can cause this terrible illness. so,no exchange of toothbrushes,shaving or tweezing implements,no unprotected sex,and most of all,no intervenous drug use. I apologise for hi-jacking your convo. but I feel a need to say something when opportunity comes my way. thanks.