Hi Lewis
It depends what type of cancer it is. Some types, e.g. breast, you can feel a lump or any abnormality can be checked by a doctor. Melanoma you might have really bad sunburn or a funny looking mole. These are usually all harmless but the doctor can have a better look and has a microscope and some other devices to see if it is cancerous. Usually if they think there could be cancer they take some tissue for a biopsy and it gets sent to labs who do staining on it to see if it is cancerous. They might then take more tissue and do more tests to confirm.
Jenny
But new techniques are being developed all the time. Particularly important is to find tests that can identify tumours when they are in their early stages, as catching it early improves the chance of survival!
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