this work is looking for the effect of tDCS of the motor cortex on the chemotherapy induced nausea and vomiting in cancer breast patients

Chemotherapy has played an important role in improving patient outcomes in oncology and is a cornerstone of therapy for most patients with cancer. Of the adverse effects, none is more feared than chemotherapy-induced nausea and vomiting (CINV).

Nausea and vomiting can adversely affect patients' quality of life and make it difficult for them to perform their activities of daily living. Uncontrolled CINV can give rise to medical complications, including poor nutrition, dehydration, electrolyte imbalances, and physical and mental deterioration.The introduction and development of antiemetic drugs have significantly improved the ability of clinicians to control CINV. The mainstays of antiemetic therapy include serotonin (5-HT3) receptor antagonists (RAs) and neurokinin 1 (NK-1) RAs. Researchers and patients are seeking additional methods of controlling CINV, such as non-drug therapies. Transcranial direct current stimulation (tDCS) is a relatively simple technique requiring only a few parts.

Inclusion Criteria:

• breast cancer therapy receiving anthracyclin based adjuvant chemotherapy and prophylaxis against nausea and vomiting

Exclusion Criteria:

• patients with intracranial metallic devices or with pacemakers or any other device.
• patients with extensive myocardial ischemia
• patients known to have epilepsy patients refusal.