Rabies, also known as hydrophobia, clinically manifested as extreme fear of water, typical patients see water, drinking water, listening to the sound of running water or even the mere mention of drinking water can cause severe spasms of the pharyngeal muscles, even if thirst is unbearable, but also dare not drink water, drinking water is difficult to swallow, fear of wind is also one of the common symptoms, breeze or other stimuli such as light, sound, touch, etc., can cause pharyngeal muscle spasms, and in severe cases also cause generalized In severe cases, it can also cause painful convulsions throughout the body. This is because when the virus invades the body, it first multiplies in the skeletal muscle of the wound, then advances along the peripheral nerves toward the central nerves, reaches the spinal cord and multiplies profusely, and finally spreads throughout the nervous system, and then the virus spreads along the peripheral nerves toward the endings, reaching many tissues and organs such as salivary glands, taste buds, muscles, and skin. The virus mainly invades the vagus nerve, the linguopharyngeal nerve and the hypoglossal nerve in the central nerve, and these nerves mainly innervate the linguopharyngeal and respiratory muscles. After being invaded by the rabies virus, when the sound of running water is heard when drinking, or when stimulated by sound or light, it can cause spasm of swallowing and muscle respiratory muscles, and difficulty in swallowing and breathing occurs, so the patient will appear to be afraid of water, wind and light.