article_snippet: The most common symptom of HL is a painless swelling in a lymph node, usually in the neck, armpit or groin.
article_snippet: The cause is unknown but risk factors include medical conditiona that weakens your immune system, taking immunosuppressant medication and being previously exposed to the Epstein-Barr virus (which causes glandular fever).
article_snippet: The only way to confirm a diagnosis of HL is by carrying out a biopsy.