Symptom Checker
Step 4: Read and complete the decision guide to learn more about your symptoms.
Diffuse Muscle Weakness
Okay, good, perhaps your weakness is due to something else.
Some rarer causes of diffuse muscle weakness include muscle inflammation, so called "idiopathic inflammatory muscle diseases." These are idiopathic conditions (that is, they are of unknown cause) and may be due to a mistaken attack of the immune system on muscle tissue.
Do you have marked weakness of the upper arms and thighs along with any of the following?
- A rash over the knuckles, eyelids, or chest
- Shortness of breath
- Fever
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