Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
The cage in a dream is prison or distress. A bird in it indicates a son or a slave. Whoever sees himself in a cage will be imprisoned or fall ill.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
The cage indicates a man's home or his shop. Getting out of it is relief for the prisoner and healing for the sick. An empty cage indicates an abandoned house or a grave.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
The cage is interpreted as prison and distress. If it has a beautiful bird in it, it is a blessed son. If it is empty, it is worry and grief.