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Electrolyte imbalance is the most common cause of leg vibration which is usually caused by dehydration.Drink plenty of fluids & take rehydration salt drinks.Stop the activity that caused the cramp.Gently stretch and massage the cramping muscle.If still the symptoms persists then you need to get tested for:
3 doctors weighed in: What causes tailbone pain and leg numbness? 3 doctors weighed in. Want a second opinion? of your symptoms seems to be irritation of a nerve in your Lumbar spine, either from a disc herniation, arthritis, disc-facet joint complex, or some other space occupying lesion. Check with an orthopod and be examined and investigated, so treatment could be started. Good Luck.