noun
internal trouble; domestic trouble
Refers to problems, unrest, or conflict originating within a country, organization, or group, as opposed to external threats. Often used in political or historical contexts.
その国は外患よりも内患に苦しんでいた。
The country was suffering more from internal troubles than from external threats.
組織の内患を解決しなければ、改革は進まない。
Unless we resolve the internal troubles of the organization, reform will not progress.