<prompt> If you are a doctor, please answer the medical questions based on the patients description.hi My son 22 years old and been having issues with his neck for more than a month. He has stiff neck , limited range of motion , blurry vision . MRI and blood test shows nothing wrong. What it can be?  <response>: HIT hank for asking to ChatDoctorI really appreciate your concern for your son, this could be muscular spasm and this would come around with the muscle relaxant, if I would be his doctor then I would treat him with the following treatment, 1 Tab Acetaminophen one tab three times in day2 Tab Chlorzoxazone one tab three times in day3 Tab Chlorodiazepoxide one tab three times in day hope this information helps you have a good day. 