Does cancer show symptoms before becoming severe?

Here's the thing. Nobody (obviously) expects, wants, anticipates, or thinks about getting cancer. I think the common answer to this question among cancer patients would be ...

Usually they do. Subtle signs that persists for no apparent reason. Constant headaches, fever, tiredness, weakness, frequent flare ups, skin issues, acidity, liver issues, ...

Yes and no. My husband was told for years that he was okay and had nothing to worry about. And he got a blood clot on the back of his leg, followed by a migraine, so bad th...