Menopause in MS. Multiple sclerosis (MS) affects 3 times more women than men, and before age 50 in about 90% cases, i.e. prior to menopause. There is broad evidence for hormonal regulation of MS in animal models and in clinical cohorts. Around menopause, many clinical patients report symptom worsening associated with hot flashes, sleep disturbance or mood changes. Additionally, individuals at MS may be at increased risk of developing osteoporosis. Longer-term, an age-related decline in gonadal steroids might represent one sex-specific influence on the known age-related increases in disability and conversion to progressive course, which is marked by accelerated brain volume loss and neurodegeneration. Recent data suggest that MS disease severity may worsen after menopause.