Acetylcholine is a neurotransmitter located at the neuromuscular junction, and it belongs to the neurotransmitter, that is, it can be understood that people can move because they follow the command of the brain, and then the nerve impulse is transmitted to the muscle through the nerve, and the place where the nerve meets the muscle is called the neuromuscular junction. Once the impulse reaches the end of the nerve, the end of the nerve releases acetylcholine, which acts on the muscle, and the impulse occurs in the muscle, i.e., a unit of movement is completed. The most common disease in which acetylcholine is involved is myasthenia gravis, also known as acetylcholine receptor antibody disease, which means that there are many acetylcholine receptor antibodies that are affected, leading to the appearance of this disease. Patients show muscle weakness, including eye muscle weakness, swallowing muscle weakness, respiratory muscle weakness, hand and foot weakness, characterized by drooping eyelids, that is, the eyelids fall down, double vision, seeing one thing as two; this disease can affect the respiratory muscles leading to breathing difficulties, patients have morning light and evening heavy, rest will improve. Myasthenia gravis is characterized by muscle weakness, light in the morning and heavy in the afternoon, and heavy after activity. Patients need to see a doctor as soon as these conditions occur.