"Why is there pain?" Cuts, bee stings, broken bones - no one likes pain. But Zoey discovers that pain is useful - it's our body's way of telling us if we're hurt, sick, or in danger. Learn about swelling around stings, stinging insects, pain in your head, foods that burn your tongue, human pain scale and pain tolerance, the purpose of pain, sensitivity of different parts of your body, relieving pain, and how you sense pain.