Definition of self-diagnose in English:

self-diagnose

verb

[no object]
  • Diagnose oneself as having a particular medical condition.

    ‘many patients self-diagnose and do not seek medical attention for their symptoms’
    • ‘They also said their patients were more likely to self-diagnose these days than they were 10 years ago.’
    • ‘This week, he explains how MediaLab Europe's technology raises the prospect of teens self-diagnosing on the Internet.’