Crying when yawning happens mainly because yawning involves contracting many facial muscles, including those around the eyes, which puts pressure on the tear-producing lacrimal glands. This pressure squeezes out tears, causing the eyes to water. Additionally, the muscles around the eyes can block tear drainage temporarily, making tears accumulate and spill out. Another theory is that yawning may help cool the brain, and tears could play a role in dissipating heat from the skull. Dry eyes, allergies, or environmental factors might also influence tear production during yawning. Overall, this is a normal physiological response and not a sign of emotional crying or distress.
