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If you have morning stiffness in the neck and other joints and also pain, then there are following possibilities
1. Rheumatoid arthritis
2. Seronegative arthropathy
3. Weak bones and osteopenia.
4. Ankylosing spondylitis. Get the RA (rheumatoid arthritis) test and the whole body DEXA (dual energy x-ray absorpitometry) scan to get a detailed idea. Hla b 27 also is significant. Straightening of the spine is due to muscle spasm.