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Spontaneous orgasm or muscle twitching, contracting and relaxing is not a part of menopause. Your pelvic muscles seem to be contracting and relaxing on their own. This can be due to pudendal nerve irritation or compression. The diagnosis is generally by a MRI or CT scan or by Pudendal Nerve Motor Latency Test (PNMLT).
Other possibilities are deficiency of potassium, calcium, sodium, vitamin B complex, or vitamins B1, B3, or B6 and Vitamin D. Along with blood levels of these get your kidney function, parathyroid gland function and adrenal function tests done because these affect the electrolyte balance in the body. Stress, alcohol, caffeine and fatigue all cause similar symptoms.
Since a confirmed diagnosis cannot be given on net please discuss these possibilities with your doctor once. Hope this helps. Take care!
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