Interferential Therapy refers to the use of low frequency electrical stimulation in clinical applications and to deliver pain relief and muscle stimulation. There is a range of devices available in the market to offer this kind of therapy. The physiotherapist would be the ideal person to know which type of interferential machine is suitable for use to treat a particular condition. The way these devices work is that they have a base unit the size of a pocket transistor and there are electrode pads attached to this base. The pads can be fixed on the muscles to be treated and the electrical current passed through the pads. The vibrations generated at the end of the pads cause the affected muscles to relax and the pain relieved. Sometimes, the therapist can combine Interferential Therapy & Physiotherapy to obtain better results. Some of these machines are referred to as tens units, tens is the acronym for Transcutaneous Electrical Nerve Stimulation. The stimulation treatment can be carried out at home also. The duration for which the pads are to be applied to the affected portion and current passed can vary with the seriousness of the condition. It can vary from 5 to 10 minutes to 20 to 25 minutes for a single sitting. Multiple sittings may be needed in specific cases. The treatment through electrical stimulation results in the tightening of the muscles and relieves the muscles of pain. Joint pains also get treated through this method.