A system and method for providing electrical stimulation to biological tissue to treat medical conditions. The system can include a lead configured to be positioned in contact with biological tissue proximate one or more occipital nerves, an implantable pulse generator configured to deliver electrical stimulation to the biological tissue via the one or more leads, and/or a power source configured to operatively connect and supply power to the implantable pulse generator. The system can further include a processor configured to communicate with the implantable pulse generator. The processor can operate the implantable pulse generator to deliver the electrical stimulation to the biological tissue via the lead. The implantable pulse generator can deliver the electrical stimulation by applying a stimulation waveform or a stimulation pattern. The stimulation waveform can include a series of stimulation pulses that can vary over time, which can reduce an effect of neural accommodation or adaptation.
