Ailment & sickness & disease &illness

1.ailment

1.1-常指小病

1.2-

eg:

childhood/common/minor ailment

2.sickness

2.1-相对严重的病，会影响平常生活

2.2-

eg:

she has been off work because of sickness.

3.disease

3.1-约等于sickness,但是常指可以传染的病

3.2-

eg:

heart/kidney/liver disease.

4.illness

4.1-除了身体还可以精神上的疾病

4.2-

eg:

mental illness.