Why Do People Yawn

There are various reasons why people yawn, which can be mainly summarized as follows: 1. Physiological fatigue and hypoxia: When the body is excessively fatigued, lacks sleep, or experiences excessive stress, respiratory function may become suppressed while the brain's oxygen consumption increases, leading to physiological hypoxia. Yawning helps inhale more oxygen, alleviates the hypoxic state, and stimulates alertness in the brain. At the same time, the contraction of muscles throughout the body during yawning can also help relax the muscles. 2. Boredom and emotions: People tend to yawn when they feel bored or uninterested in something. This may be related to the activity of certain neural centers in the brain that are closely associated with interest and attention. 3. Environmental factors: If the oxygen level in the environment is low, it may also cause hypoxia in the body, thereby triggering yawning. 4. Health issues: Certain health conditions, such as anemia, hypoglycemia, cerebral arteriosclerosis, and cerebral infarction, may also cause yawning.