What illness causes stomach pain and anal fullness?

Symptoms of abdominal pain and anal fullness usually involve potential problems in multiple systems, and are generally first considered to be caused by intestinal diseases, gynecological inflammation, or cystitis. Intestinal conditions such as enteritis or bowel dysfunction may lead to difficulty in defecation, with stool accumulating in the rectal ampulla, repeatedly stimulating the intestinal nerve roots and thereby causing a sensation of heaviness and distension. This discomfort is not limited to the anal area but may also affect the entire abdomen. Gynecological inflammations, especially infections of the upper reproductive tract, can also cause abdominal pressure and distending pain. Such infections may not only remain confined to the reproductive system but may also adversely affect the gastrointestinal system, triggering corresponding symptoms. Inflammation of the bladder and urethra may also result in abdominal pain and anal fullness. Urethral burning is a common symptom of cystitis, and during acute episodes, the inflammation may spread to adjacent areas such as the perineum, intensifying discomfort. When these symptoms occur, timely medical evaluations—such as abdominal ultrasound, urinalysis, and gynecological examinations—should be performed to determine the underlying cause. Based on the diagnosis, doctors will develop an appropriate treatment plan, and patients should actively cooperate with treatment to prevent disease progression.