This article reports on the cases of two female patients with chronic progressive stage multiple sclerosis who suffered from regular worsening of their symptoms starting approximately a week prior to menstruation and abating at menstruation onset. Such symptoms were resolved in both patients two months following the start of treatment with the extracranial application of weak electromagnetic fields.

R. Sandyk, Premenstrual Exacerbation of Symptoms in Multiple Sclerosis is Attenuated Treatment with Weak Electromagnetic Fields, International Journal of  Neurosci, 83(3-4),
December 1995, p. 187-198.