Electrotherapy, known as convulsion-free electroconvulsive therapy, is used for patients with depression accompanied by severe suicidal self-injury. Convulsion-free electroconvulsive therapy provides rapid relief from the symptoms of depression and is more effective in patients with a high risk of suicide, and may be effective in patients for whom other treatments have not worked. Electroconvulsive therapy can also be used to treat patients whose own somatic condition is poor and who are at high risk for medication. For most patients, the adverse effects are relatively few and mild. The most common adverse effects are mainly headache, muscle pain, confusion, and memory difficulties. Of these, headache and muscle pain, which are relatively mild and usually occur only after the first treatment, can be relieved with pain medication, and confusion and memory difficulties usually return a few days to a few weeks after the end of treatment. As a kind of physical therapy, convulsion-free electroconvulsive therapy must be used under the guidance of a professional doctor.