an untidy state; a lack of order or organization
His financial affairs were in complete disorder .
The room was in a state of disorder.
violent behaviour of large groups of people
an outbreak of rioting and public disorder
an illness that causes a part of the body to stop functioning correctly
a blood/bowel, etc. disorder
He was suffering from some form of psychiatric disorder.
These are all words for a medical problem.
a medical problem affecting humans, animals or plants, often caused by infection
He suffers from a rare blood disease.
a medical problem, or a period of suffering from one
She died after a long illness.
disease or illness?
Disease is used to talk about more severe physical medical problems, especially those that affect the organs. Illness is used to talk about both more severe and more minor medical problems, and those that affect mental health.
Disease is not used about a period of illness.
( rather formal ) an illness that causes a part of the body to stop functioning correctly
a rare disorder of the liver
disorder一般不传染，多与有关精神问题的词连用，如psychiatric/personality/mental/eating disorder（精神错乱；人格障碍；精神紊乱；进食障碍）。谈到身体方面的问题常与下列词连用，如blood/bowel/kidney disorder（血液病；肠道失调；肾脏疾病），这些疾病一般用serious、severe或rare等词修饰。
A disorder is generally not infectious. Disorder occurs most frequently with words relating to mental problems, for example psychiatric , personality , mental and eating . When it is used to talk about physical problems, it most often occurs with blood , bowel and kidney , and these are commonly serious , severe or rare .
an illness that is caused by bacteria or a virus and that affects one part of the body
a throat infection
a medical problem that you have for a long time because it is not possible to cure it
a heart condition
( rather formal ) an illness that is not very serious
( informal ) an infectious illness that is usually fairly mild
a nasty flu bug