Poorly functioning blood vessels lead to the characteristic muscle weakness that so many cancer patients experience. Artur Plawgo/Science Photo Library via Getty Images Tumors can destroy the blood ...

Muscle weakness may be due to a chronic condition or an infection. Conditions that can weaken muscles include Addison’s disease, anemia, diabetes, fibromyalgia, and more. Muscle weakness is a lack of ...

Short-term muscle weakness is common and can be caused by something as simple as a tough workout. However, persistent muscle weakness without apparent cause could indicate an underlying health ...