Singer Halsey, 29, revealed her health battle in an Instagram post. Leukaemia can be hard to spot because the tell-tale symptoms can often indicate other unrelated illnesses, experts say.Singer Halsey, 29, revealed her health battle in an Instagram post. Leukaemia can be hard to spot because the tell-tale symptoms can often indicate other unrelated illnesses, experts say.Read MoreHealth News | Mail Online
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