<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been experiencing delusions or hallucinations and stiffness all over my body, what could be wrong?  <response>: These can be symptoms of hyperthyroidism, which is commonly caused by an overactive thyroid gland, and, less commonly, they can be symptoms of thyroid cancer. I recommend running some tests to rule out any possibility of thyroid cancer. 