Did cavemen get sick?

I am a university graduate studying the life and philosophy of cavemen. As a matter of fact they did get sick, but with diseases and viruses that are not known to man today. For example, the derrofist virus was much like the flu, just slightly more irritating and was caught under the skin. Many of the cavemen died of this though as they did not have the simple things that would stop it today. Another illness is the winchton disorder, which produced large purple bulges on the skin and then work its way into the blood stream, killing them. this is like leukemia today. In conclusion cavemen did get ill and sick just like us today, but did not have the same technology to help it. Hope this helps :)