Rabies is caused by the invasion of the rabies virus into the body, and the disease is divided into the small amount of virus proliferation in the tissue, invasion of the central nervous system, and spread to the organs and other stages. 1. Small amount of virus proliferation in the tissue: after rabies virus invades into the body from the broken skin or mucous membrane, it can proliferate in a small amount in the muscle cells attached to the wound, and then invade the nerve endings near the body. 2. Invasion of the central nervous system: rabies virus can quickly spread centripetally along the axons of the nerves, invade the spinal cord, and then invade the brain. It mainly invades the nerve cells in the brainstem and cerebellum. 3. Spreading to organs: Rabies virus can spread from central nerves to peripheral nerves and invade various organs and tissues. Organs and tissues with high viral load include salivary glands and olfactory nerve epithelium. If there is any discomfort, it is recommended to consult a doctor in time for diagnosis and treatment.