Seminal vesiculitis is swelling and irritation inside the seminal vesicles—the paired pouches that mix most of your ejaculate fluid. Because these glands sit deep behind the bladder, the ache is felt in the pelvis, not in the sac. The first clue is a deep, dull ache above the pubic bone or in the lower back that gets worse after ejaculation. Ejaculate itself changes color. Instead of pearly white, it can be pink, rust-colored, or even contain small blood clots. Pain during climax is common. The deep pelvic muscles cramp for a few seconds, and the ache lingers for minutes to... Learn more