Frequent electrotherapy itself is relatively safe, but a small number of people can appear certain hazards such as reduced muscle nerve sensitivity, endocrine disorders, other, etc., it is recommended that patients should follow the doctor’s instructions. Clinically used electrotherapy, including direct current electrotherapy, low and medium frequency electrotherapy, high frequency electrotherapy, different types of treatment between the side effects are different. 1. Reduced muscle nerve sensitivity: some localized if long-term application of low and medium frequency electrotherapy, can produce stimulation of local muscle nerves, thus reducing muscle nerve sensitivity. 2. Endocrine disorders: when the glandular area is subjected to DC or high-frequency electrotherapy, such as the thyroid area, it affects the endocrine secretion of the human body, and endocrine disorders may occur as a result of long-term electrotherapy. 3. Others: Long-term high-frequency electrotherapy may cause side effects such as lack of concentration, reduction of white blood cells and memory loss. For people with malignant tumors, wearing a pacemaker, local inflammation, to avoid the use of direct current, low and medium-frequency electrotherapy, high-frequency electrotherapy, to prevent the exacerbation of the condition and so on. Note that electrotherapy itself is a safe treatment, and it is recommended to follow medical advice.