Yawning can be a stereotypical physical behavior or a sign or symptom of a variety of diseases, such as stroke, Parkinson’s disease and epilepsy. 1. Physiological phenomenon: Yawning may be a stereotypical physiological behavior, which may occur when the body is in a state of drowsiness, which is usually relieved after rest. 2. Disease factors (1) Stroke: patients may appear yawning, numbness and weakness of one side of the limbs, headache, nausea and other symptoms. (2) Parkinson’s disease: patients may have symptoms such as resting tremor, motor retardation, sleep disorders, etc. Yawning can be caused by sleep disorders. (3) Epilepsy: Epilepsy is a chronic disease in which sudden abnormal discharges of neurons in the brain lead to transient brain dysfunction, and patients may have symptoms such as yawning, unsteadiness, falling, and sudden cessation of activity. Yawning may also have other causes, it is recommended to seek medical treatment as soon as possible, under the guidance of a professional physician to clarify the cause of the disease, and timely treatment for the cause.