Anal thrombosis is a painful swelling in the anal area caused by a venous blood clot. Here you can read more about it!


The Analthrombose (Anal venous thrombosis) is a painful swelling in the anal area, caused by a venous blood clot. The differentiation to hemorrhoids is often not easy. Unlike hemorrhoids, anal thromboses are very painful and do not prolapse out of the anal canal. Due to the high level of suffering, patients often have a strong desire for treatment. Here you can read all important information about anal thrombosis.

ICD codes for this disease: ICD codes are internationally valid medical diagnosis codes. They are found e.g. in doctor's letters or on incapacity certificates. K64

Product Overview


  • What is an anal thrombosis?

  • How does the anal thrombosis develop?

  • How is anal thrombosis treated?

  • How to avoid an anal thrombosis?

What is an anal thrombosis?

The anal thrombosis (anal venous thrombosis) was formerly called "external hemorrhoids". However, anal thromboses and hemorrhoids are two different clinical pictures with different symptoms and developmental mechanisms:

Hemorrhoids and thrombosis of the anus are both caused by blood clots in a blood vessel. The haemorrhoids, however, affect fine arterial plexuses in the anal canal, which play a role in the occlusive mechanism of the anus. On the other hand, anal thrombosis affects the venous plexus around the anus. This means that in the case of anal thrombosis, the palpable nodes are not located in the anal canal (as in hemorrhoids), but directly at the exit and are thus visible at all times. Hemorrhoids are only visible from the outside in advanced stages - they come out of the anal canal (severity grade 2, 3) or are permanently curved outwards (grade 4) with increased abdominal pressure (for example when pressing during bowel movements).

Other than hemorrhoids, anal thrombosis is also very painful, so sitting is almost impossible. In hemorrhoids, on the other hand, unpleasant itching and pressure are prevalent.

How does the anal thrombosis develop?

The nodes on the edge of the anus are blood clots in the small veins that are found around the anus. Especially high abdominal pressure contributes to their development. This is caused by chronic constipation, overweight or long-term excessive pressing exercises, such as those used in resistance training. Even during pregnancy, the abdominal pressure is increased and the unborn child rests on the venous plexus on the anus. In the birth process, it comes in addition to strong pressing. Hemorrhoids and anal thrombosis are therefore a common problem in pregnancy and after delivery.

Prolonged sitting further increases venous pressure and prevents the blood from draining well from the anal veins.

In addition, as with any type of thrombosis, general risk factors such as lack of exercise, vascular diseases and blood coagulation disorders also apply to anal thrombosis. The intake of the anti-baby pill is associated with a general risk of thrombosis. Other hormonal influences such as the monthly hormone fluctuations in women may also favor anal thrombosis.

How is anal thrombosis treated?

Thrombosis of the anus can be treated in a variety of ways, depending on its size and pain. A fresh thrombosis may be taken by the doctor under anesthesia to prick the blood clot. The wound usually heals without consequences. A minor thrombosis can also be treated with ointments and painkillers.

How to avoid an anal thrombosis?

Since long sitting and high abdominal pressure (pressing exercises during weightlifting, pressing during bowel movements) are risk factors for the development of anal thrombosis, one should restrict both as far as possible.

Also, frequent constipation promotes an anal venous thrombosis: it can often be counteracted by more physical activity and a change in diet. If this does not help, you can soften the stool with the help of swelling agents. Ask your doctor how to control your constipation.

Mechanical stress on the anus (as in anal intercourse) is another risk factor involved in the onset of a Analthrombose plays a role and should therefore be avoided.

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    Thromboses - life-threatening hikers

    The ability of the blood to clot is vital - otherwise, the human would bleed even in minor injuries. But if a blood clot forms in the veins, danger is in arrears. Because when such a lump goes on a wander, it can clog vessels - and thus cause a stroke, a heart attack or a pulmonary embolism. Read here if you are particularly at risk for thrombosis and how you can protect yourself.

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    Carrier blood flow

    Ingestion of blood is a risk factor: thromboses occur mainly in the veins, because here the blood flows more slowly than in the arteries.Most commonly, this happens in the legs, where the blood must be pumped to the heart against gravity. A great help for the venous pumps is movement - it prevents thrombosis.

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    Whoever rested, rusts

    Inactivity, however, is poison for the vessels: Long sitting (especially crowded!), For example, when traveling, increases the risk of Batthrombosen. Therefore, "tourist class syndrome" is called this phenomenon. But even those who have to lie in bed for a long time have a higher risk of thrombosis. Therefore, bedridden patients or those who have undergone surgery receive blood thinners.

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    Thick blood

    There is another risk of thrombosis if the blood is too thick. This is the case, for example, if you sweat too much or drink too little. But even hormonal changes can increase the risk of thrombosis - for example, during pregnancy or by taking the pill. Anyone who smokes then is particularly at risk: certain substances in cigarettes also alter the blood clotting and damage the vessel walls.

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    Risky calcification

    Whether due to cigarettes, diabetes, injuries or other factors: Vascular damage causes thrombosis in the soil. In particular, atherosclerosis is risky: it has formed on the inner site of the arteries plaques of calcium and fats. If these are torn, the body tries to mend the tear by clotting the blood. This can also form a clot.

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    Graft in the heart

    But clots can also develop directly in the heart, such as heart failure, when the blood is no longer effectively pumped out of the heart. Also in cardiac arrhythmias, in which the blood is swirled in the heart chambers. From there, the clots reach the brain very quickly, where they can cause a stroke.

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    Warning sign for thrombosis

    Some thromboses do not cause any symptoms at all. Others are noticeable: they trigger pain - especially under pressure. The affected part of the body is swollen, reddish and feels warmer. Then seek medical attention immediately to avoid dangerous clot migration!

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