However, men who have a prostatectomy no longer produce semen, so they have dry orgasms only. Radiation Therapy Radiation therapy may cause patients to become very tired as treatment continues. Resting is important, but doctors usually advise patients to try to stay as active as they can. Patients may have diarrhea or frequent and uncomfortable urination. In addition, when patients receive external radiation therapy, it is common for the skin in the treated area to become red, dry, and tender.
Radiation therapy can also cause hair loss in the pelvic area.
The loss may be temporary or permanent, depending on the amount of radiation used. Radiation therapy causes impotence in some men. Hormone Therapy Orchiectomy, LHRH agonists, and estrogen often cause side effects such as loss of sexual desire, impotence, and hot flashes. When first taken, an LHRH agonist tends to increase tumor growth and may make the patient's symptoms worse. Gradually, however, the drug causes a man's testosterone level to fall.