What should you know about seminoma cancer?

Seminoma is a type of germ-cell tumour. It most often begins in the testicle, although germ-cell tumours can occur in other locations. The name describes the tumour type; it does not by itself describe how far the disease has spread or which treatment is needed.

A clinician may review symptoms, examine the affected area, arrange imaging, and check tumour markers in blood. A tissue sample or the removed tumour may then be examined to confirm the diagnosis and guide staging. These findings are considered together rather than interpreted in isolation.

Arrange a prompt appointment with a doctor experienced in assessing testicular or germ-cell tumours. Take a list of medicines, previous illnesses, and questions about fertility or future family plans. Imaging and blood tests help the team plan care, while surgery may remove the tumour and provide tissue for a detailed diagnosis.

Treatment depends on the tumour's location, stage, marker results, and your health. Options can include observation with scheduled checks, surgery, chemotherapy, or a combination. Read about [Tumour Removal Surgery](/treatments/surgical-oncology/tumour-removal-surgery/) and [Chemotherapy](/treatments/systemic-therapy/chemotherapy/) to understand these approaches.

Seek urgent medical help for sudden severe testicular pain, rapidly increasing swelling, heavy bleeding, trouble breathing, or fainting. Contact your clinical team promptly for fever during treatment, repeated vomiting, new severe pain, or swelling that is changing quickly. These symptoms need assessment even when the cause is not cancer.

Ask which findings confirm seminoma, whether the tumour is confined to its starting site, and which scans or blood tests are still needed. Discuss the purpose and timing of surgery or chemotherapy, possible effects on fertility, how follow-up will work, and which symptoms should trigger a same-day call.