Stellate Ganglion Block to Reduce Hot Flushes

Inclusion Criteria: * Female * Age: 30-70 years * Mean daily flush frequency of 10 or more and a hot flush score of 15 or more * Absence of any non-menopausal cause of flushing * Post-menopause amenorrhea for more than 1 year in healthy postmenopausal women * In case of breast cancer or ovariectomy induced menopause: ovariectomy for \> 6 months. Adjuvant therapy with estrogen-receptor blocker or an aromatase inhibitor. Exclusion Criteria: * Use of medication that affects flushing:oestrogens, progestogens, clonidine, naloxone, paroxetine, fluoxetine, venlafaxine, gabapentin, luteïniserend hormone releasing hormones receptor antagonist * Receiving chemotherapy of radiotherapy * Active psychiatric disease * Active concurrent disease * Allergic reactions against local anesthetics of the 'amide' type or contrast media.