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Polymyositis Differential DiagnosisAka: Dermatomyositis Differential Diagnosis, Myopathy Causes, Muscle Weakness Causes

See Also
1. Polymyositis
2. Dermatomyositis
Differential Diagnosis: Cutaneous (Dermatomyositis)
1. HIV Infection (once Immunodeficiency occurs)
2. Lichen planus
3. Polymorphous light eruption
4. Seborrheic Dermatitis
5. Systemic Lupus Erythematosus
6. Psoriasis
7. Contact Dermatitis
8. Atopic Dermatitis
9. Trichinosis
10. Alcohol
Differential Diagnosis: Neuromuscular Disorders
1. Genetic Muscular Dystrophies
2. Spinal Muscular Atrophy
3. Myasthenia Gravis
4. Eaton Lambert Syndrome
5. Amyotrophic Lateral Sclerosis
6. Myotonia
7. Organophosphate Poisoning
8. See Neuropathy
  1. Guillain-Barre (other autoimmune polyneuropathies)
  2. Multiple Sclerosis
  3. Diabetes Mellitus
  4. Porphyria
Differential Diagnosis: Endocrine and Metabolic Disorders
1. Electrolyte
2. Hypothyroidism
3. Hyperthyroidism
4. Hypoparathyroidism
5. Hyperparathyroidism
6. Cushing's Syndrome
7. Addison's Disease
8. McArdle's disease (Glycogen Phosphorylase Deficiency)
9. Adult acid maltase deficiency
10. Carnitine-palmitoyltransferase deficiency
11. Periodic paralysis
Differential Diagnosis: Toxic Myopathy
1. See Medication Causes of Myositis
2. Steroid Myopathy
3. Alcoholic Myopathy
Differential Diagnosis: Infections
1. Viral
  1. Influenza
  2. Epstein Barr Virus
  3. Coxsackievirus
  4. Rubella
  5. Human Immunodeficiency Virus (HIV)
  6. Polio
  7. Rabies
2. Bacterial
  1. Staphylococcus
  2. Streptococcus
  3. Clostridium
  4. Salmonella typhus
  5. Mycobacterium leprae
  6. Lyme Disease
  7. Syphilis
3. Parasitic
  1. Toxoplasmosis
  2. Trichinella
  3. Schistosomiasis
  4. Cysticercosis
Differential Diagnosis: Miscellaneous
1. Polymyalgia Rheumatica
2. Acute Rhabdomyolysis
3. Systemic Sclerosis
4. Amyloidosis
5. Sarcoidosis
References

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This page was written by Scott Moses, MD. This page was last revised before 5/10/08, prior to consistent tracking of revision date. This page was last published on 6/1/2008. Please send comments and questions to the editor. Contact information may be found on the page About the Family Practice Notebook. These pages are best viewed with Microsoft Internet Explorer 6.0.