A method for diagnosing myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) is provided in the present disclosure. The present disclosure provides a method that uses the B cell receptor (BCR) repertoire as an indicator of myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS). One or more variables selected from the group consisting of the frequency of use of one or more genes in the IgGH heavy chain variable region of the BCR in a subject, the BCR diversity index in a subject, and the level of one or more immune cell subpopulations in a subject can be used as an indicator of ME/CFS in the subject.
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