There are different types of radiation.

I’ve had 7+ weeks of IMRT savage radiation. Had no side effects at all. Had it in the morning first thing, went to work right after for a full day. About five years later, I started having incontinence problems, but that could be due to the prostatectomy. I had eight years prior.

I’ve also had three sessions of SBRT radiation to zap a metastasis on my spine. Again, no side effects at all.

Side effects from radiation can vary from
Fatigue
Radiation proctitis
Rectal issues
Rectal bleeding
Bladder infection
Breaks in bones radiation damage to bones
Fibroses in bladder reduce capacity

In general, toxicities after postprostatectomy radiation using photon-based techniques have been tolerable, although the rates of late grade 2 and gastrointestinal (GI) and genitourinary (GU) toxicities range from 10% to 20% with image-guided intensity-modulated radiation therapy (IMRT).

What this means. “ late grade 2 and gastrointestinal (GI) and genitourinary (GU) toxicities”
Above describes moderate symptoms of damage to the bowel and bladder, requiring minimal intervention but impacting daily activities, and occurring after salvage radiotherapy for a recurrence or persistent cancer after initial treatment. Gastrointestinal (GI) symptoms can include moderate diarrhea or bleeding, while genitourinary (GU) symptoms might involve increased urinary frequency, pain, or intermittent bleeding.