Interactions between different types of diseases

Different types of disease may interact.
- For instance, human immunodeficiency virus (HIV) infections, which lead to AIDS, affect the efficiency of the immune system. This means people with HIV and AIDS get more infectious diseases than a healthy person. A common infectious disease that occurs in HIV patients is tuberculosis. Tuberculosis is a bacterial infection, mainly affecting the lungs.
living in cells can be the trigger for cancers.
- For instance, the majority of cases of cancer of the are linked with a virus present in the female called HPV.
The reaction of the immune system to and other foreign bodies can trigger allergic reactions that lead to skin rashes and .
- For instance, severe respiratory infections in babies can lead to asthma in later childhood.
Severe physical ill health can lead to and other types of mental illness.

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