Anal Vein Thrombosis: Causes

Pathogenesis (development of disease)

The cause of anal venous thrombosis is a clot (blood clot) in the subcutaneous (“under the skin“) veins of the caudal haemorrhoidal plexus. A predisposing factor may be the presence of enlarged hemorrhoidal cushions.

Anal venous thrombosis is often accompanied by phlebitis (inflammation of the superficial veins). It is not uncommon for there to be no identifiable cause

Etiology (Causes)

Biographic causes

Behavioral causes

  • Nutrition
    • Spices, unspecified
  • Stimulant consumption
    • Alcohol
  • Physical activity
    • Unaccustomed heavy physical exertion, jogging, cycling, etc.
    • Lifting, pressing (increased intra-abdominal pressure).
  • Anal intercourse/anal sex (mechanical cause).

Disease-related causes.

Mouth, esophagus (food pipe), stomach, and intestines (K00-K67; K90-K93).

  • Hard bowel movements with forced pressing.
  • Diarrhea (diarrhea)

Pregnancy, childbirth and puerperium (O00-O99)

  • During childbirth
  • At the end of pregnancy

Other causes

  • Condition after proctological surgery
  • Increased intra-abdominal pressure during defecation (bowel movement).
  • Thermal exposures such as cold (e.g., sitting on cold surfaces), muggy weather