Prostate cancer

Hi Godbless .

Yes you should get it checked. Pelvic Radiotherapy can cause long term side effects, one of which could be lymphedema which is a build up fluid in the pelvis, groin or legs. This can happen months or years after initial treatment if the lymph system has a problem draining fluid away. It is usually managed with diuretics initially but you may need to be referred to a lymphedema clinic. My husband developed it in one leg and it does occasionally flare up and is treated by his osteopath who has been trained in lymphatic drainage and massage. 

There is a section on it in the attached link.

https://www.macmillan.org.uk/cancer-information-and-support/treatment/types-of-treatment/radiotherapy/pelvic-radiotherapy/late-effects-of-pelvic-radiotherapy

There may be another reason for the swelling but anything out of the ordinary for you should always be checked out by a doctor.