D2I2.
rare

Idiopathic pulmonary haemosiderosis

haemosiderosis (IPH) is a lung disease of unknown cause that is characterized by alveolar capillary bleeding and accumulation of haemosiderin in the lungs. It is rare, with an between 0.24 and 1.23 cases per million people.

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Plain-language summary adapted from Wikipedia. Not medical advice.