Hypnosis refers to a special psychological state, which is usually guided by professional hypnotists through language suggestion or other means. Under hypnosis, people will enter a state of relaxation, concentration and easy to be influenced by hints. Hypnotists usually use this state to help people solve psychological problems, relieve pain and improve their learning ability.

Hypnosis can be traced back to ancient Greece and Egypt, but it was not officially recognized and studied until the19th century. Hypnosis was originally used to control pain and assist delivery, but with the deepening of research, people began to explore the influence of hypnosis on people's psychology and behavior.

Modern hypnosis is defined as a state of mind, in which individuals concentrate and are easily influenced by hints. This state is usually caused by the suggestion and guidance of the hypnotist. In this state, people feel relaxed and self-absorbed, and it is easy to enter a state of deep relaxation and imagination, but they will not lose consciousness.

Hypnosis can be divided into mild hypnosis, moderate hypnosis and deep hypnosis. Mild hypnosis is the most common one, and people can still be clearly aware of the surrounding environment and things in this state. Moderate hypnosis is a deeper hypnotic state, but there is still some conscious activity. In the state of deep hypnosis, people will be completely absorbed in the instructions of the hypnotist, and sometimes they will have amnesia.

Hypnosis is widely used. The most common use is as a psychotherapy method. Hypnotists can use hypnosis to help patients relax and solve psychological problems, such as phobia, stress and anxiety. In addition, hypnosis is also used for pain management, quitting smoking, enhancing memory and improving learning efficiency.

Although hypnosis is widely used, there are some controversies and potential risks. Some people doubt the effectiveness of hypnosis, especially when it is used for some chronic diseases or serious mental diseases. In addition, hypnosis may lead to a decrease in people's awareness of the surrounding environment, and may also produce negative reactions, such as headache and nausea.

Generally speaking, hypnosis, as a psychotherapy method, has been widely used and gradually recognized. Although there are some disputes and risks, hypnotists usually follow strict operating procedures and safety measures to ensure the effectiveness and safety of treatment.