Can pituitary tumors cause brain fog and cognitive issues?

Hormonal imabalance: The pituitary gland controls hormones, so tumors there can affect personality by causing the overproduction or underproduction of hormones. Hormonal imbalances can cause problems with mood, emotions, body weight, and sexual function. Patients may also experience headaches and lethargy. See your neurologist if your cognitive issues worsen. http://www.nlm.nih.gov/medlineplus/ency/article/000704.htm

Do you have one?: Have you been diagnosed with a pituitary tumor? I suppose it's possible for a pituitary tumor to cause those symptoms, e.g. secondary hypothyroidism; but usually there are also physical symptoms. If you mean a BIG GROWING tumor, you shouldn't have that without also developing a bitemporal hemianopsia and walking into doorposts and walls. Why does this in particular worry you?