Dampness is a hazardous problem in many of our homes. There are many factors responsible for this widespread dampness that again affects our health seriously. You may deal with dampness in a number of ways:

First of all if the dampness is cause due to penetrating damp, you need a strong protection from it. Small patches can be corrected using simple external repairs but in case it is widespread, a more permanent solution comprising of special render system is needed.
Injecting a chemical D.P.C can solve the problem of rising damp.

In case of condensation, often damp is formed. Activities like bathing, cooking, and washing also causes it when moisture is formed and cannot escape. To control it, open windows; install exhaust fans in kitchens, toilets to keep them ventilated. Warm up your rooms at a consistent temperature and try not having a damp corner.
Keeping a dehumidifier at home also helps deal with damp.