Were diseases caused by evolution, so we would know when man was?

Question

fully evolved becuase he would be able to get rid of the diseases and then also know that people were done forming into new types?

Answer 1

There's no such thing as fully evolved.  Diseases of aging exist because they didn't interfere with our reproduction and raising children, which didn't require living past 30 when humans evolved.  If you mean infectious diseases, then the answer above is correct; we are constantly co-evolving with our pathogens.

Answer 2

No, organisms that cause disease and organisms that are affected by those organisms that cause disease are constantly co-evolving together.  Mammals have evolved a tough immune system that can seek out intruders.   Bacteria and other disease causing parasites evolve ways to evade those immune systems.  And so on, and so on.

Answer 3

Some genetic disease were caused by evolution.  By that I mean that some spontaneous mutations in human history created the alleles that cause diseases like sickle cell anemia and cystic fibrosis.  The interesting thing about these diseases, though, is that both are expressed  as recessive diseases.  This means that a genetic heterozygote (an individual who has one copy of the disease allele and one normal copy) has no disease, but the heterozygote is protected from other diseases such as malaria (sickle cell anemia) and cholera (cystic fibrosis).  By protected I mean that carriers of the trait (heterozygotes) are more likely to survive infection by the microbes that cause malaria and cholera than individuals who do not carry the disease allele.  This is a beautiful example of Darwinian evolution in action.  A new phenotype arises by chance, and the microbes act as a selective pressure that favors heterozygotes.  Descent with modification by means of natural selection.

This is an ongoing process that continues today.  Evolution is a never ending journey.