The use of steroids is widespread, and they are prescribed for different types of systemic diseases. Steroids provide fast and effective pain control in rheumatic diseases. Some systemic side effects of steroids are commonly seen and well known to clinicians. Psychological side effects are not rare during systemic steroid applications. Nevertheless, the diagnosis rate is quite low. We present an attenuated mentally retarded patient with ankylosing spondylitis on steroid treatment who had psychotic symptoms. We aimed to show steroid-induced psychotic complications.