At the beginning of the thrombosis, patients may have no signs or very common ones.
In some instances, the signs may be very serious :
extreme fatigue,
pains, fever,
abdominal swelling caused by liquid (ascites).
All intermediate stages are possible.
The initial signs can spontaneously, reduce, disappear or become worse.
Later, the signs reflect the inconvenience of the blood flow in the liver vessels (portal hypertension): abdominal varicose veins, some of which -the oesophageal varicosis- can be the origin of a digestive haemorrhage.
In case of hepatic veins thrombosis, chronic ascites, jaundice, mental confusion, infections will confirm the hepatic functions are affected.
In case of a portal thrombosis, its extension can cause a severe intestine pain.
Nevertheless, even after a very acute start, the effect on the vessels can remain totally invisible. The body has, indeed, some very efficient means to compensate.