<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been experiencing some strange symptoms lately. I have been feeling very underweight and weak in my lower back. Additionally, Ive been having cramps and spasms in my elbows.  <response>: Based on your symptoms, it is possible that you have oral leukoplakia. Have you noticed any white or gray patches in your mouth or on your lips? That is a common symptom of this disease. 