### Patient: Doctor, I have been feeling extremely fatigued and my legs have been cramping and having spasms. Additionally, my muscles feel weak and I have been experiencing abnormal involuntary movements. Can you tell me what may be happening to me? 
### Doctor: Based on your symptoms, it is possible that you have Amyotrophic lateral sclerosis (ALS), also known as Lou Gehrig's disease. This disease affects the nerve cells that control your voluntary muscles and can cause weakness, spasms, and abnormal movements. We will need to perform further tests to determine a diagnosis.