Health is the state of the body. When doctors want to know about a patient's usual health, they ask questions such as:
What is your general health like?
How's your health, generally?
If you are in good health, you are well and have no illness (disease). If you are healthy you are normally well and can resist illness. If you are fit, you are well and strong.
Sickness
Sickness has a similar meaning to illness. It is also used in the names of a few specific diseases, for example sleeping sickness and travel sickness. Patients also talk about sickness when they mean nausea[ˈnɔːzɪə] and vomiting. The combination sickness and diarrhoea means vomiting and diarrhoea [daɪəˈrɪə].