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While the causes of these feelings is unclear, numbness or tingling sensations in the hands, arms, or legs are felt by many people with fibromyalgia. The feelings may be especially bothersome when they occur in the mornings along with morning stiffness on arising. The medical term for these sensations is paresthesia.
A: Ankle and leg cramps at night often occur for unknown reasons, but structural disorders, such as spinal stenosis; medications for blood pressure and cholesterol; or conditions such as dehydration and diarrhea can cause the discomfort, according to Mayo Clinic. Pregnancy and muscle fatigue also cause ankle cramps. Continue Reading