The inventions include methods for treating neuropathy and apparatus for use in the methods. The apparatus may include a controller configured to output an asymmetric biphasic signal. The apparatus can also include a first container and a second container. The first and the second containers can be configured to hold a fluid. The apparatus may also include a first electrode and a second electrode. The first electrode and the second electrode can be configured to be in electrical contract with the fluid held by the container, and can be configured to be coupled to the controller. The electrodes may be configured to receive the asymmetric biphasic signal output from the controller.