My dad has Lymphoma Stage VI. He's in Chemo. Cancer has spread now has to take Painkillers that's how crucial the pain is. Should we be worried that Chemo is loss cause in his case? By though way my dad is 80 years old.

I doubt that his doctors would put him through chemo if they didn't feel there was a chance for it to be effective. Unfortunately, his age may present some problems, since chemo is indiscriminate-- it kills cancer cells AND healthy cells. Depending on the regimen, there could be a number of side effects he could suffer.

Stage IV is of course very serious, but (although you don't say what kind of lymphoma he has) certainly survivable. Do you know what kinds of painkillers he's being prescribed? Are they short-term narcotics (like Vicodin, percocet, codeine, Darvocet), or long-term narcotics (morphine, fentanyl, oxycontin)? Doctors are often cautious about putting patients on long-term, long-acting narcotics for fear of creating dependency, and what they put him on may be an indication, however subtle, of how they regard his chances.

Also keep in mind that chemo is a rather miserable experience, and doctors who think a patient is a 'lost cause' might focus on maintaining his quality of life, i.e. keeping him pain-free but also not putting him through the rigors of chemo. I would imagine that the decision to start chemo is a good sign, but I'm not a doctor.