- Takayasu arteritis
- Systemic sclerosis
- Systemic lupus erythematosus
- Sjogren's syndrome
- Sensitive skin
- Seafood allergy
- Rheumatoid arthritis
- Rheumatic fever
- Rheumatic chorea
- Reactive arthritis
- Raynaud's syndrome
- Psoriatic arthritis
- Primary combined immunodeficiency
- Polymyositis
- Polymyalgia rheumatica
- Polyarteritis nodosa