Mucous dream meaning is explained below using 2 different sources. Each interpretation is shown with its source.
Interpretation 1 — myjellybean
Coughing up mucous, or seeing mucous come out of your body, is a negative dream symbol. This dream may mean that you need to put some distance between yourself and someone who’s not good for you. It may also indicates that you have made a negative choice in some important matter. Alternately, it can represent the dreamer’s general fear about the future.
If you dreamed of seeing mucous that did not come from yourself, you are having trouble trusting someone. This could be wise - someone may be trying to take advantage of you in some way.
Source: My Dream Interpretation • Author: myjellybean
Interpretation 2 — Ibn Seerin
(Blear-eyed, Discharge of the eyes, Rheum) To see one’s eyes dimmed with foul discharges, or to see oneself blear-eyed in a dream means gazing at what is unlawful, becoming apathetic toward evil people, or suffering from financial difficulties, and for a woman it means inability to conceive children.
Source: Islamic Dream Interpretation • Author: Ibn Seerin