<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi, 48Hours ago I felt sudden pain in my back. I feels, as if I have sore muscles on my upper back just below the nape of my neck. Any sudden movement is very hard for me and if I am in the wrong position, it really hurts. Adding to that: It is very hard to take a deep breathe and to swallow food. My Question: Should I go to the doctor immediatly or should I wait till next morning? And what could these signs indicate? Emile I m male, 27 years old, a bit overweight, but I started going to the gym since two months and I practice badminton for three years now  <response>: Hi Thanks for posting your query. Sudden onset of pain at the site mentioned by you is most likely due to two possible cause. 1. Acute Muscle spasm: It is sustained strong contraction of muscles of your neck or upper back muscles due to exertion or faulty posture especially while sleeping. 2. Cervical disc disease: Working out in gym in improper posture can cause disc problem at your neck region. Among these two muscle spasm is a simple problem which will relieve by itself in a day or two. But disc problem needs medical attention. If it has been more than 2 days of pain and no improvement then better you consult your doctor. Any clarification feel free to ask. Happy to answer. 