We report on a case of a patient with unknown Addison's disease who showed a variety of complications after caesarean section (preterm labour, breech presentation, 32 wks.). The main complications were endomyometritis, altered serum electrolytes, severe hypotension and weakness. Based on clinical observations and cortisol provocation test, the patient was diagnosed with Addison's disease on day 10 after caesarean section. Substitution with corticoids was started immediately. With this medication, rapid restitution and normalisation of the pathological parameters could be achieved.