what are the signs and symptoms of a pituitary tumor?
['Headaches.', 'Vision problems.', 'Unexplained tiredness.', 'Mood changes.', 'Irritability.', 'Changes in menstrual cycles in women.', 'Erectile dysfunction, which is the inability to achieve or maintain an erection in men and is caused by hormone changes.', 'Infertility, which is the inability to have children.']