Health and diseaseSpec 4.2.2.5
Health is the state of physical and mental well-being.
Diseases, both communicable and non-communicable, are major causes of ill health. A communicable disease is caused by a pathogen and can spread from person to person. A non-communicable disease cannot. Other factors including diet, stress and life situations may have a profound effect on both physical and mental health.
How different types of disease interact
| Interaction | Meaning |
|---|---|
| Immune system defects | Defects in the immune system mean that an individual is more likely to suffer from infectious diseases |
| Viruses and cancer | Viruses living in cells can be the trigger for cancers |
| Immune reactions and allergies | Immune reactions initially caused by a pathogen can trigger allergies such as skin rashes and asthma |
| Physical and mental health | Severe physical ill health can lead to depression and other mental illness |