A one-month delay in chemotherapy has a certain effect on the effectiveness of chemotherapy, so it is recommended that chemotherapy be administered at the prescribed time. The interval between chemotherapy treatments usually varies depending on the patient’s condition and the selected regimen, and patients should strictly follow the doctor’s instructions to avoid delaying the chemotherapy. Delaying chemotherapy may lead to a decrease in the effectiveness of the treatment, and in some cases, delayed chemotherapy may cause tumor cells to become resistant to the treatment, leading to a change in the treatment regimen. Patients undergoing chemotherapy can experience more intense adverse symptoms such as vomiting, diarrhea, and hair loss. Delaying chemotherapy for one month can make this toxic side effect effectively alleviated, but it will have a greater impact on the treatment effect, so it is not recommended to delay chemotherapy for one month. If you feel unwell after undergoing chemotherapy, you should seek immediate medical examination for treatment.