Source: The Great Interpretation of Dreams (Ibn Sirin)
The spleen in a dream is unlawful money. Its pain indicates illness or worry due to unlawful money.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
The spleen indicates the place of anger. Its enlargement indicates frequent anger.
Source: Signs in the Science of Expressions (Ibn Shaheen)
The spleen is interpreted as worry. Whoever sees pain in it will be afflicted with worry.