Radiation therapy is a common treatment option for colorectal cancer, and it can have various side effects. The following is a week-by-week summary of some of the anticipated side effects of radiation therapy for colorectal cancer:

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Week 1-2:

Patients may experience fatigue and skin reactions, such as redness, itching, and dryness in the treatment area. Some people may also experience diarrhea or constipation.

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Week 3-4:

Fatigue may continue to be an issue, and patients may experience new symptoms such as abdominal cramping, nausea, and vomiting. Some people may also experience increased diarrhea or constipation, as well as changes in bowel habits.

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Week 5-6:

Symptoms may continue to worsen during this time, with increased fatigue and skin reactions. Patients may also experience painful bowel movements and may notice blood in their stool.

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Week 7-8:

By this point, most patients will have completed their radiation therapy. However, some side effects may continue to persist, such as skin reactions and bowel changes. Patients may also experience long-term effects, such as bladder and sexual dysfunction.

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It's important to note that not all patients will experience the same side effects, and the severity of symptoms can vary widely. Healthcare providers will monitor patients closely throughout their treatment and provide support and management strategies to help alleviate any discomfort or complications that arise.