Guinea pigs are very vocal creatures, and they use their squeaks to communicate with each other and with their humans. There are many different reasons why a guinea pig might squeak, but some of the most common ones include:

• To get attention: Guinea pigs are social animals, and they love to be around their humans. If they're feeling neglected, they might squeak to get your attention.
• To show happiness: Guinea pigs also squeak when they're happy. If you're petting them or giving them treats, they might squeak to show their appreciation.
• To express fear or pain: If a guinea pig is scared or in pain, they might squeak to let you know.
• To communicate with other guinea pigs: Guinea pigs use squeaks to communicate with each other, too. They might squeak to greet each other, to show dominance, or to warn each other of danger.

If you're not sure why your guinea pig is squeaking, it's always best to err on the side of caution and check to see if they're okay. But if they're just squeaking to get your attention or to show their happiness, then there's no need to worry.