Here are the constellations that are next to or near Cancer:

* To the north: Lynx (a faint constellation), Ursa Major (the Big Dipper), and Gemini (the Twins).

* To the south: Hydra (the Water Snake), Leo (the Lion), and Sextans (the Sextant).

* To the east: Leo

* To the west: Gemini

Cancer is a relatively faint constellation, making it a bit harder to find amongst its brighter neighbors.