What research shows
More common in nightmares and in the dreams of people in physically demanding work.
The body
Dreaming about blood
Vitality, injury, or family.
The psychological reading
Read as life force and what is draining it. Blood connected to family imagery often points at inherited patterns.
What tradition claimed
Widely read as an omen concerning relatives — the phrase "blood relatives" is doing the work.
Included as cultural history. Traditional dream books are frequently ominous and have no predictive value.
How to record a dream, why the feeling matters more than the content, and when recurring nightmares are worth a doctor rather than a dictionary — set out once on the main page.
Before you look anything up
How the dream felt matters more than what was in it. The same image can arrive as comfort or as threat, and that difference tells you more than any entry in a dictionary — including this one.