Most modern diseases are caused by prolonged exposure to a combination of faulty lifestyle, food habits and toxic environmental factors. Chronic stress has a vital role in immune disorders.

There are two types of immunity which protects our body from any infection. These are Innate and Adaptive. Innate immunity - this type of immunity is present at birth and provides the first barrier against microorganisms which causes infections. Adaptive Immunity - it is the second barrier to infections and acquired later in life as - immunity after an immunization.

The higher mortality rate is observed due to AIDS, it is the best example of immune disorders

In Ayurveda it is known as Byadhikshamata "OJA", and described two types as Par and Apar Oja. .