Sign signals
Aquarius is fixed air and Cancer is cardinal water, so their instincts are quite different. Cancer seeks emotional safety and belonging, while Aquarius seeks space, ideas and wider community.
Three things to read
Romance can work when Aquarius respects Cancer's sensitivity and Cancer does not read every need for space as rejection.
The main challenge is that Cancer leads with feeling while Aquarius leads with logic.
Agree on simple emotional routines so care is visible without making the bond feel heavy.
Beyond sun signs
Sun-sign compatibility is the headline. Vedic Guna Milan reads both full kundlis — the eight kootas, Mangal Dosha and Moon-sign synastry — only after both birth details are supplied.
Questions
They can be compatible with effort, but this is a naturally mixed air-water pairing.
Cancer needs reassurance, consistency and a softer emotional tone from Aquarius.