What Is an Anal Abscess?
What Are Haemorrhoids?
Haemorrhoids, also known as piles, are swollen blood vessels located in or around the anal canal. They develop when increased pressure causes these veins to enlarge.
Depending on their location, haemorrhoids are classified as:
- Internal Haemorrhoids: Located inside the rectum and often painless, though they may cause bleeding during bowel movements.
- External Haemorrhoids: Found beneath the skin around the anus and may cause discomfort, swelling or itching.
- Thrombosed Haemorrhoids: Occur when a blood clot forms within an external haemorrhoid, leading to sudden pain and a firm lump.
Symptoms of an Anal Abscess
- Persistent throbbing pain around the anus
- A tender, swollen lump near the anal opening
- Redness or warmth over the affected area
- Pain that worsens when sitting or passing stools
- Pus or fluid drainage
- Fever, chills or feeling generally unwell
Symptoms of Haemorrhoids
Symptoms of haemorrhoids vary depending on whether they are internal or external, as well as their severity. Common symptoms include:
- Bright red blood on toilet paper or in the toilet bowl
- Itching or irritation around the anus
- Mild discomfort during bowel movements
- A lump around the anal opening
- A prolapsed haemorrhoid that protrudes after passing stools
- Sudden pain if a thrombosed haemorrhoid develops
Unlike anal abscesses, haemorrhoids do not usually cause fever or pus discharge.
What Causes an Anal Abscess and Haemorrhoids?
Although both conditions affect the same area of the body, they develop for different reasons.
Causes of an Anal Abscess
Most anal abscesses occur when bacteria infect a blocked anal gland. However, certain medical conditions and factors can increase the likelihood of developing an infection, including:
- Crohn's disease
- Diabetes
- A weakened immune system
- Previous anal infections
- Injury to the anal region
Causes of Haemorrhoids
Haemorrhoids develop when pressure within the veins of the rectum and anus increases over time. Common contributing factors include:
- Chronic constipation
- Frequent straining during bowel movements
- Pregnancy
- Prolonged sitting on the toilet
- Obesity
- A low fibre diet
- Ageing
How Are Anal Abscesses and Haemorrhoids Treated?
The management of anal abscesses and haemorrhoids varies according to the condition, its severity and whether complications are present.
Anal Abscess Treatment
An anal abscess typically requires prompt drainage to remove the accumulated pus and control the infection. This is usually performed under local or general anaesthesia, depending on the size and location of the abscess.
Antibiotics may be prescribed for selected patients, particularly those with diabetes, weakened immunity or more widespread infection. Follow-up is important as some patients may later develop an anal fistula that requires further treatment.
Haemorrhoid Treatment
Treatment for haemorrhoids depends on the severity of symptoms. Milder cases often improve with conservative measures such as:
- Increasing fibre intake
- Drinking adequate fluids
- Avoiding prolonged straining during bowel movements
- Using prescribed medications where appropriate
For persistent or advanced haemorrhoids, procedures such as rubber band ligation or haemorrhoid surgery may be recommended to provide longer-term relief.
When Should You See a Doctor?
Persistent or worsening symptoms should not be ignored, particularly if an anal abscess is suspected. Medical assessment is recommended if you experience:
- Severe or worsening anal pain
- Fever together with anal swelling
- Pus or persistent discharge
- Heavy or recurrent rectal bleeding
- Symptoms that do not improve despite self-care
- A painful lump that rapidly enlarges
Early diagnosis allows appropriate treatment before complications develop and helps identify whether symptoms are caused by an anal abscess, haemorrhoids or another colorectal condition.
Seek an Accurate Diagnosis for Lasting Relief
Anal abscesses and haemorrhoids may affect the same area of the body, but they are different conditions that require different treatment approaches. Understanding these differences can help you recognise when medical assessment is needed and reduce the risk of complications.
At Thesurgeons, a colorectal clinic in Singapore, care begins with an accurate diagnosis and a clear understanding of your condition. Led by Dr Chew Min Hoe, patients receive comprehensive assessment and personalised management for colorectal conditions, including anal abscesses, haemorrhoids and anal fistulas. If you are experiencing persistent anal pain, swelling or bleeding, schedule a consultation to identify the underlying cause and discuss the most appropriate treatment for your needs.
Frequently Asked Questions About Anal Abscesses and Haemorrhoids
Meet Our Colorectal Specialist in Singapore
Dr Chew Min HoeMedical DirectorSenior Consultant, General & Colorectal SurgeonMBBS (Singapore), MRCS (Edinburgh), MMed (Surgery), FRCS (Edinburgh)
Dr Chew Min Hoe has devoted over 25 years of service to the public sector and was the founding Head of the Department of Surgery at Sengkang General Hospital (SKH). His clinical speciality is General and Colorectal Surgery with special niche interests in colorectal cancer, advanced pelvic tumours, hereditary conditions as well as perianal surgery. He is highly involved in education and research and has published more than 100 peer-reviewed articles.
