When all of the cards in a Tarot spread are negative, it can signify a period of difficulty and struggle. This could mean the emergence of challenges that need to be faced and dealt with, and a period of growth and personal development. It could also represent the ending of an old pattern or cycle and the beginning of a new one that is harder and more difficult. In general, it's a sign to be aware of what is coming up for you and take the necessary steps to overcome it while relying on your inner strength and resilience.