Joint symptoms
Muscle stiffness or pain
Usually worse in the early morning often with pain and  stiffness.
Your GP will consider the following differential diagnoses:
 | Normal response to strenuous  exercise | Suggested by: fit healthy, unaccustomed exercise 1 to 2 days before. | 
| Confirmed by: spontaneous resolution. | |
| Polymyalgia rheumatica | Suggested by: onset over weeks or months, stiff, painful, and tender proximal muscles. Fatigue, fever in elderly person. | 
| Confirmed by: elevated ESR. Rheumatoid factor -ve, prompt response to prednisolone, no other cause (e.g. infection on follow-up). | |
| Management: See your GP | |
| Rheumatoid arthritis | Suggested by: early morning stiffness. Fingers  showing swan neck or boutonnireâ deformities. Thumbs show  Z-deformities. MCP joints and wrists are sublux giving ulnar deviation. Knees: valgus or varus deformity and popliteal Baker's cysts. Feet: subluxation of meta-tarsal heads with hallux valgus, clawed toes. | 
| Confirmed by: rheumatoid factor  +ve, anti-IgG autoantibody. FBC: Normochromic anaemia, Elevated ESR when active. | |
| Ankylosing spondylitis | Suggested by: onset over months or years. Stiffness and progressive loss of spinal movement. Kyphosis and spinal extension. | 
| Confirmed by: bamboo spine on back X-ray and loss of sacroileal joint space. Rheumatoid factor -ve, HLA-B27 +ve. | |
| Primary muscle disease | Suggested by: onset over weeks to years. Predominant weakness. | 
| Confirmed by: CPK, electromyography and muscle biopsy. | |
| Primary hypothyroidism | Suggested by: onset over weeks to months. Predominant fatigue. Also cold intolerance, depression. | 
| Confirmed by: TSH, FT4. | |
| Early manifestation of occult malignancy | Suggested by: onset over weeks or months. Weight loss, anorexia. | 
| Confirmed by: subsequent appearance of malignancy, especially spinal secondary deposits. | |
| Fibromyalgia | Suggested by: variable onset -weeks to years. Diffuse pain and stiffness but no features of specific diagnosis. | 
| Confirmed by: no subsequent development of features of a specific diagnosis, normal ESR, Rheumatoid factor -ve, CPK normal, TSH & FT4 normal. | 
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