There is a hard lump in the anus but no blood in the stool

The presence of a lump in the anus is mainly caused by perirectal abscess, and it may also be caused by internal hemorrhoids. It is recommended that patients go to the hospital for an internal medicine examination to determine what causes the lump in the anus. In the case of a hard lump in the anus, it does not necessarily cause bloody stools, because bloody stools are mainly caused by hemorrhoids, while bloody stools may be caused by gastrointestinal diseases caused by bacterial infection, so you should pay attention to gastrointestinal health.

Perianal abscess, also known as anorectal abscess, is called anal carbuncle in traditional Chinese medicine. Perianal abscess is an acute suppurative infectious disease occurring around the anus, anal canal and rectum. It is a bacterial infection and is the predecessor of anal fistula. This disease and anal fistula are one of the three major anorectal diseases, with an incidence rate of about 2%, accounting for 8% to 25% of anorectal diseases. It is more common in men aged 20 to 40 years old. The incidence rate in men is 3 to 4 times that in women. The incidence rate in children is also relatively high. Perianal abscesses should be taken seriously after they occur. Abscesses occurring in the ischiorectal fossa and pelvic rectal fossa on both sides of the anus and under the perineal fascia on the front side of men are the most dangerous. If not treated promptly, they may lead to infectious shock and even be life-threatening.

Causes

This disease is a bacterial infection in the intestines, and "intestinal bacteria" are the source and the cause of the disease. The "anal sinus" is the entrance for infection and is also the internal opening for abscesses and fistulas. The "anal glands" are the route of infection, where infection occurs first and then spreads. The "perianal space" is the final site of disease. Intestinal bacteria enter the anal sinus and cause inflammation, blocking the anal gland opening, causing obstruction of anal gland fluid outflow and causing anal gland infection. The infection spreads to the perianal space through the muscle space and lymphatic vessels, and finally forms an anal canal and rectal abscess.

Clinical manifestations

The main symptom of perianal abscess is pain, which can be very severe and gradually worsens. Many patients say they cannot eat or sleep. After the abscess bursts on its own, the pain is temporarily relieved. Low-lying abscesses cause severe anal pain that persists. A perirectal abscess (high position) is not necessarily painful. Because the area around the rectum belongs to the pelvic cavity, the autonomic nerves distributed here are insensitive to ordinary stimulation. The most important manifestations are local heaviness and a feeling of urge to defecate. Another symptom of perianal abscess is fever, which can reach over 40°C. Generally speaking, the larger and deeper the abscess cavity, the greater the probability of fever. Some patients may also experience difficulty urinating and defecating, poor appetite, and insomnia.