Conditions that cause low fibrinogen include:

Severe blood loss
Impaired blood clotting
Liver damage
Cirrhosis
Acute hepatitis
Use of certain medications

Aside from the conditions that cause low fibrinogen, there are also types of low fibrinogen. This condition is revealed in a fibrinogen test. Types of low fibrinogen include:

Afibrinogenemia
Afibrinogenemia means there is a complete absence of fibrinogen in the body. This condition can cause severe bleeding.

Hypofibrinogenemia
Hypofibrinogenemia refers to situations where the level of fibrinogen in the body is very low. A less common type, hypofibrinogenemia causes less bleeding.

Dysfibrinogenemia
Dysfibrinogenemia indicates that fibrinogen levels are near normal, but the protein doesn't function properly. This condition is observed to be congenital.