Could Scott Lang fight severe illnesses?

Like just got inside the body and just destroy cancerous cells or viruses? They did it with Ultron after a fashion in the Mighty Avengers. Also , is Reed Richard not smart enough to cure almost all of the Earth Bound diseases?

Heh. You are right.

Yes. He saved the hulk from Lou Gherigs disease I believe.

Yes. But unfortunately, Reed Richards is useless.