A small change in one testicle can be easy to dismiss, especially when it does not hurt. Yet a painless lump or swelling is one of the most recognisable testicular cancer symptoms.
Most testicle lumps are not cancer. Still, noticing something unusual is a reason to contact your GP rather than wait for it to become painful. Knowing what is normal for your body helps you spot changes and describe them clearly.
Early testicular cancer symptoms to recognise
A lump on or inside a testicle
A new testicle lump is the most common warning sign. It may feel like a small firm area, a pea-sized bump or a larger swelling. Cancer-related lumps are often painless, so lack of pain is not reassuring enough to rule anything out.
Swelling or a change in size
A swollen testicle, particularly one that is gradually getting bigger, deserves examination. One testicle is commonly a little larger than the other, but a new or increasing difference matters more than natural asymmetry. Some people notice a change in shape rather than an obvious separate lump.
Heaviness, firmness or an unfamiliar texture
The scrotum may begin to feel unusually heavy, firm or hard. A testicle that once felt smooth may seem different to the touch.
A persistent ache or discomfort
Although testicular cancer often causes no pain, it can sometimes lead to an ache in the testicle, scrotum, groin or lower abdomen. Pain alone has many other possible causes, including infection. Persistent discomfort should be assessed rather than assumed to be cancer or dismissed as a strain.
Less common signs that also deserve attention
Less commonly, someone with testicular cancer may experience breast tenderness or swelling. Back pain, an unexplained cough, breathlessness or other general symptoms can occur with more advanced disease, but these are not specific testicular cancer signs.
The practical distinction is that a new lump, swelling or change in a testicle warrants a GP appointment whether or not other symptoms are present.
How to check your testicles without overcomplicating it
There is no national screening programme for testicular cancer in the UK. Getting familiar with your body is not the same as a formal screening test, and there is no proven need to follow a rigid self-examination schedule. However, looking and feeling occasionally can make unusual changes easier to notice.
A warm shower or bath can make the scrotal skin more relaxed. Gently support one testicle at a time and roll it between your fingers and thumb. Notice its approximate size, smoothness, firmness and any new lump. Repeat on the other side without squeezing hard or repeatedly prodding a tender area.
Behind each testicle is the epididymis, a softer, cord-like structure involved in carrying sperm. It is normal to feel this. One testicle may also hang lower than the other. A guide to checking your testicles can help you understand these normal features, but a diagram or home check cannot diagnose a lump.
For example, imagine noticing that your right testicle feels slightly firmer than it did a few weeks ago, even though you cannot find a distinct bump. Record which side changed and when you first noticed it, then arrange an examination. You do not need to wait until you can describe a clear lump.
Could a lump be something other than cancer?
Yes. Fluid-filled cysts, a hydrocele, enlarged veins called a varicocele, inflammation and infections can all cause swelling or an unusual sensation.
A lump that seems soft or painless is not automatically harmless, just as a hard lump is not automatically cancer. Home checks cannot reliably distinguish these conditions. If you want to understand the possibilities, read about common causes of a testicle lump, then let a clinician assess your particular symptoms.
When to contact a GP and when to seek emergency help
Arrange an urgent GP appointment if you find a new lump, swelling, increasing size, unusual firmness or a persistent ache. NHS guidance also recommends seeking advice for any new change in how a testicle looks or feels. If appointments are difficult to obtain, explain that you have discovered a new testicular change and ask how quickly you can be assessed.
Sudden, severe testicle pain is different: go to A&E immediately or call 999. The same applies to testicle pain with nausea, vomiting or abdominal pain, or pain lasting more than an hour or continuing at rest. A twisted testicle, known as testicular torsion, can cut off its blood supply and needs emergency treatment. Do not wait for a routine GP visit.
What happens during an assessment?
Your GP will ask when the change started, whether it is painful and whether the swelling has grown. They may examine the testicles and nearby lymph nodes.
If further assessment is needed, you may have a scrotal ultrasound, which uses sound waves to examine the area. Blood tests for tumour markers may also be used, often alongside specialist assessment. An ultrasound helps distinguish different types of swelling, but no single home observation can confirm or exclude cancer.
If tests or treatment do not explain a continuing change, return to your GP. Our guide to when testicular pain needs medical attention offers further context, but it cannot replace an examination.
Who should be particularly aware?
Testicular cancer most often affects people aged 15 to 49, although it can occur outside that range. Risk is higher for people with a history of an undescended testicle, a previous testicular cancer diagnosis or a father or brother who has had it. Most people with these risk factors will not develop the disease, and someone without them can still notice a concerning change.
Frequently asked questions
Are testicular cancer lumps always painless?
No. Many are painless, but discomfort or aching can occur. Pain or its absence cannot identify the cause of a lump, so a new change needs clinical assessment either way.
Can testicular cancer symptoms come and go?
Symptoms can be noticed inconsistently, particularly when a change is small. A lump or swelling should not be ignored because you could not feel it clearly on a second check. Tell your GP what you originally noticed.
Does a swollen testicle mean I have cancer?
No. Swelling commonly has other explanations, including fluid build-up or infection. Because the causes cannot be reliably separated at home, arrange an examination, especially when the swelling is new or increasing.
Is checking my testicles the same as cancer screening?
No. Being aware of changes is useful, but the UK does not have a routine testicular cancer screening programme. If you notice a possible symptom, speak to your GP rather than relying on repeated self-checks.
The most useful next step is a simple one
Recognising testicular cancer symptoms is not about diagnosing yourself. It is about noticing a new lump, swelling, heaviness or change in texture and getting it examined. Most changes have causes other than cancer, and testicular cancer is often highly treatable. Prompt medical advice provides a clearer answer than waiting and worrying.