Addison's disease is primary hypoadrenalism. It results from progressive destruction of the adrenals. We present a literature review and the case of a 24-year old lady presenting with repeated hospital admissions for 'hyperemesis grvidarum' since 10 weeks of POA. On clinical examination she was found to have a very low BMI with mucous membrane pigmentation and no other significant clinical findings. Biochemical tests confirmed the diagnosis of Addison's disease.