Hi, I appreciate you seeking guidance. Commonly blood tests/ tumor markers, scans and biopsies are usually employed to diagnose cancer, with biopsy being the gold standard that clinches the diagnosis. The test requirements, as mentioned above, vary from cancer to cancer. In fact, there always are symptoms but in certain early stage cancers they are quite mild and hence go unnoticed mostly. Routine health checkups may help catch these early, however. Specifically, basis the cancer society recommendations, you need to be watchful about seven cardinal warning signs (c. A. U. T. I. O. N) of cancer, as given below -
c - change in bowel habits
a - a sore that does not heal you - unusual bleeding or discharge
t - thickening or enlargement of a lump I - indigestion or difficulty swallowing (/ dysphagia)
o - obvious change in a wart or mole
n - nagging cough or hoarseness
hope this answers your question.
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