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 hours.

Urgency and burning may tag along. You pee more often, feel a sting at the finish, and the urine can look clear while the burn stays.

Some men notice a “heavy” feeling in the rectum during bowel movements, as if the gland is being pressed from behind.

Fever is rare, but low-grade chills and a general “flu” feeling can appear if the infection is acute.