Ayurveda treat diseases by shamans(settlement of Doshas) and shodhana(removal of dosha /toxins)
Shodhana means removal of toxins, doshas from the body. In simple work we can say DETOXIFICATION of body. PANCHAKARMA is the way for shodhana. According to Ayurveda if we removes the toxins out of the body chances for relapse of the disease is very less as compare to suppression of the toxins.
There is many other procedure along with these five which help to easy removal of toxins through body. Like Shirodhara, Dahankarma, Lepa, Shalishashtika Pinda sweda, Patrabpottali, Hrud basti, Janu Basti, etc.
Abhyang (massage) and Swedana (steaming/fomentation) are PRE PANCHAKARMA procedure has to done before all karma.
Abhyang- is application of oil to all over the body or to specific part of the body. This helps for reducing of the Vata in the body. Depending upon complaints we have to do Stokes of massage towards or away from heart called as Anulom and Pratilom massage .
Swedana means Fomentation with medicines. It helps to liquefy the toxins spread in the body and bring them to abdomen, From there it is easy to remove by one of the Panchakarma.